RPM is a powerful and mature command-line driven package management system capable of installing, uninstalling, verifying, querying, and updating Unix software packages. Each software package consists of an archive of files along with information about the package like its version, a description, and the like. There is also a library API, permitting advanced developers to manage such transactions from programming languages such as C, Perl or Python. 

RPM - RPM Package Manager

librsync is a library for calculating and applying network deltas, with an interface designed to ease integration into diverse network applications. librsync encapsulates the core algorithms of the rsync protocol, which help with efficient calculation of the differences between two files. The rsync algorithm is different from most differencing algorithms because it does not require the presence of the two files to calculate the delta. Instead, it requires a set of checksums of each block of one file, which together form a signature for that file. Blocks at any in the other file which have the same checksum are likely to be identical, and whatever remains is the difference.

librsync -- network-delta library

Linux Desktop Testing Project is aimed at producing high quality test automation framework (using GNOME / Python) and cutting-edge tools that can be used to test Linux Desktop and improve it. It uses the Accessibility libraries to poke through the application's user interface. We strive to help in building a quality desktop. The GNU LDTP core framework uses Appmap and the recorded test-cases to test an application and then gives the status of each test-case as output. As of now, GNU LDTP can test any GNOME-based GUI applications, which are accessibility-enabled, Mozilla, Openoffice.org, any Java application (should have a UI based on swing) and KDE 4.0 applications based on QT 4.0 (based on the press releases by KDE). 
 Its features include
 <UL>
	<LI>LDTP concepts are derived from <a class="http" href="http://safsdev.sourceforge.net/Default.htm">Software Automation Framework Support</a></LI>
	<LI>LDTP supports verification of actions performed (guiexist, verifystate, etc)</LI>
	<LI>Writing test scripts are very easy, the script writer need not know about the object hierarchy </LI>
	<LI>CPU / Memory performance monitoring of application-under-test can be measured</LI>
	<LI>From the XML log, we can gather HTML report using XSLT</LI>
	<LI>Group based execution, which provides precise control on the flow of test-script execution</LI>
	<LI>Scripts can be written as a reusable component and for that the data can be stored / retrieved in XML</LI>
	<LI>User-friendly Text Editor with syntax highlighting for generating and grouping test data</LI>
	<LI>Objects are identified both statically and dynamically</LI>
	<LI>Record / Playback</LI>
 </UL>

 Moderator comments: Ubuntu, GNOME are using this framework.

Linux Desktop Testing Project is aimed at producing high quality test automation framework (using GNOME / Python) and cutting-edge tools that can be used to test Linux Desktop and improve it. It uses the Accessibility libraries to poke through the application's user interface. We strive to help in building a quality desktop.

Linux Desktop Testing Project

OSSEC is a full platform to monitor and control your systems. It mixes together all the aspects of HIDS (host-based intrusion detection), log monitoring and SIM/SIEM together in a simple, powerful and open source solution.
 
OSSEC watches it all, actively monitoring all aspects of Unix system activity with file integrity monitoring, log monitoring, rootcheck, and process monitoring. With OSSEC you won't be in the dark about what is happening to your valuable computer system assets. 
When attacks happen OSSEC lets you know through alert logs and email alerts sent to you and your IT staff so you can take quick actions. OSSEC also exports alerts to any SIEM system via syslog so you can get real-time analytics and insights into your system security events.

OSSEC is a full platform to monitor and control your systems. It mixes together all the aspects of HIDS (host-based intrusion detection), log monitoring and SIM/SIEM together in a simple, powerful and open source solution.

OSSEC -  Host-based Intrusion Detection System

KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V). It consists of a loadable kernel module, kvm.ko, that provides the core virtualization infrastructure and a processor specific module, kvm-intel.ko or kvm-amd.ko.  Using KVM, one can run multiple virtual machines running unmodified Linux or Windows images. Each virtual machine has private virtualized hardware: a network card, disk, graphics adapter, etc. 

kernel virtual machine

libvips is a demand-driven, horizontally threaded image processing library. Compared to similar libraries, libvips runs quickly and uses little memory. It has around 300 operations covering arithmetic, histograms, convolution, morphological operations, frequency filtering, colour, resampling, statistics and others. 
 
It supports a large range of numeric formats, from 8-bit int to 128-bit complex. Images can have any number of bands. It supports a good range of image formats, including JPEG, TIFF, PNG, WebP, FITS, Matlab, OpenEXR, PDF, SVG, HDR, PPM, CSV, GIF, Analyze, NIfTI, DeepZoom, and OpenSlide. It can also load images via ImageMagick or GraphicsMagick, letting it load formats like DICOM.

libvips is a demand-driven, horizontally threaded image processing library. Compared to similar libraries, libvips runs quickly and uses little memory. It has around 300 operations covering arithmetic, histograms, convolution, morphological operations, frequency filtering, colour, resampling, statistics and others. 

libvips - A fast image processing library with low memory needs

Cockpit makes Linux discoverable, allowing sysadmins to easily perform tasks such as starting containers, storage administration, network configuration, inspecting logs and so on. It is like a graphical “desktop interface”, but for individual servers. You can install Cockpit on many Linux operating systems including Debian, Fedora and RHEL. 
 
Its features include: 
<ul><li>Configure a firewall</li><li>Create and manage virtual machines</li><li>Download and run containers</li><li>Browse and search system logs</li><li>Upgrade software</li><li>Manage user accounts</li><li>Use a terminal on a remote server in your local web browser</li><li>Diagnose network issues</li><li>Examine SELinux logs and fix common violations in a click</li><li>Inspect detailed metrics that correlate CPU load, memory usage, network activity, and storage performance with the system’s journal</li></ul>

Cockpit makes Linux discoverable, allowing sysadmins to easily perform tasks such as starting containers, storage administration, network configuration, inspecting logs and so on. It is like a graphical “desktop interface”, but for individual servers. You can install Cockpit on many Linux operating systems including Debian, Fedora and RHEL. 

Cockpit - Interactive server admin interface for Linux

libxml++ is a C++ API for the popular libxml XML parser, written in C. libxml is famous for its high performance and compliance to standard specifications, but its C API is quite difficult even for common tasks. libxml++ presents a simple C++-like API that can achieve common tasks with less code. Unlike some other C++ parsers, it does not try to avoid the advantages of standard C++ features such as namespaces, STL containers or runtime type identification, and it does not try to conform to standard API specifications meant for Java. Therefore libxml++ requires a fairly modern C++ compiler such as g++ 3. But libxml++ was created mainly to fill the need for an API-stable C++ XML parser which could be used as a shared library dependency by C++ applications that are distributed widely in binary form. That means that installed applications will not break when new versions of libxml++ are installed on a user's computer. Gradual improvement of the libxml++ API is still possible via non-breaking API additions, and new independent versions of the API that can be installed in parallel with older versions. These are the general techniques and principles followed by the GNOME project, of which libxml++ is a part.

libxml++ is a C++ wrapper for the libxml XML parser library.

Libxml++

Libvirt is collection of software that provides a convenient way to manage virtual machines and other virtualization functionality, such as storage and network interface management. These software pieces include an API library, a daemon (libvirtd), and a command line utility (virsh). It provides a single way to manage multiple different virtualization providers/hypervisors like Xen, OpenVZ, VirualBox, Microsoft Hyper-V hypervisor, VMware.

Libvirt - The virtualization API

nxlog is a modular, multi-threaded, high-performance log management solution with multi-platform support. In concept it is similar to syslog-ng or rsyslog but is not limited to unix/syslog only. It can collect logs from files in various formats, receive logs from the network remotely over UDP, TCP or TLS/SSL . It supports platform specific sources such as the Windows Eventlog, Linux kernel logs, Android logs, local syslog etc. 
 Writing and reading logs to/from databases is also supported. The collected logs can be stored into files, databases or forwarded to a remote log server using various protocols. The old BSD Syslog and the newer IETF syslog standard is fully supported by nxlog in addition to other custom formats. A key concept in nxlog is to be able to handle and preserve structured logs so there is no need to convert everything to syslog and then parse these logs again at the other side. It has powerful message filtering, log rewrite and conversion capabilities.

nxlog is a modular, multi-threaded, high-performance log management solution with multi-platform support. In concept it is similar to syslog-ng or rsyslog but is not limited to unix/syslog only. It can collect logs from files in various formats, receive logs from the network remotely over UDP, TCP or TLS/SSL . It supports platform specific sources such as the Windows Eventlog, Linux kernel logs, Android logs, local syslog etc.

nxlog - Multi platform Log management

SoX is the Swiss Army Knife of sound processing utilities. It can convert audio files to other popular audio file types and also apply sound effects and filters during the conversion. SoX can play and record audio files on most platforms.





SOX - Sound Processing Utilities

Flatpak is the next-generation technology for building and installing desktop applications. It has the power to revolutionize the Linux desktop ecosystem. Flatpak (formerly xdg-app) is a software utility for software deployment, package management, and application virtualization for Linux desktop computers. It provides a sandbox environment in which users can run applications in isolation from the rest of the system.
 
Unlike package managers, Flatpak can safely update applications on the fly. Its sandboxing technology prevents exploits and hinders malicious applications. It can simultaneously install multiple versions of the same application.
 
Flatpak helps to create one app bundle and distribute it to the entire Linux desktop market. Developers can develop and test their application in an environment that's identical to the one users have.

Flatpak is the next-generation technology for building and installing desktop applications. It has the power to revolutionize the Linux desktop ecosystem. Flatpak (formerly xdg-app) is a software utility for software deployment, package management, and application virtualization for Linux desktop computers. It provides a sandbox environment in which users can run applications in isolation from the rest of the system.

Flatpak - The future of Application Distribution

Libwebsockets is a lightweight pure C library built to use minimal CPU and memory resources, and provide fast throughput in both directions. It can     be configured to use OpenSSL or CyaSSL to provide fully encrypted client and server links including client certificate support.

Libwebsockets - C library for lightweight websocket clients and servers

The OpenSync project provides synchronization framework. OpenSync's main and most practical goal is to create a solution to synchronize PIM (Personal Information Management - addressbook contacts, calendar events and tasks, personal notes, etc) data between mobile devices like mobile phones, PDAs (Personal Digital Assistant), desktop computer PIM tools and services.

OpenSync - synchronization framework for PDA

LibreOffice is the free power-packed Open Source personal productivity suite for Windows, Macintosh and Linux. LibreOffice is the perfect choice for home users, businesses, government and other organizations. It's native file format is the ISO standardized ODF (Open Document Format), but LibreOffice can open and save Microsoft Word, PowerPoint and Excel files, as well as many other formats, bringing you the widest-available compatibility with other products. It has 6 feature-rich applications for all your document production and data processing needs:
 
 <a title="Word processor" href="http://www.libreoffice.org/features/writer/">WRITER</a> is the word processor inside LibreOffice.Auto-completion, Auto-formatting and Automatic spelling checking makes your tasks easy. Writer is powerful enough to tackle desktop publishing tasks such as creating multi-column newsletters and brochures.
 
 <a title="Spreadsheet" href="http://www.libreoffice.org/features/calc/">CALC</a>is the spreadsheet inside LibreOffice. Analyze your data with Calc and then use it to present your final output. Charts and analysis tools help bring transparency to your conclusions. A fully-integrated help system makes easier work of entering complex formulas. Add data from external databases such as SQL or Oracle, then sort and filter them to produce statistical analyses. Use the graphing functions to display large number of 2D and 3D graphics from 13 categories, including line, area, bar, pie, X-Y, and net – with the dozens of variations available, you're sure to find one that suits your project.

<a title="Presentation" href="http://www.libreoffice.org/features/impress/">IMPRESS</a> is the fastest and easiest way to create effective multimedia presentations. It is similar to MS Powerpoint. Stunning animation and sensational special effects help you convince your audience. Create presentations that look even more professional than the standard presentations you commonly see at work.

<a title="Graphics editor" href="http://www.libreoffice.org/features/draw/">DRAW</a> lets you build diagrams and sketches from scratch. A picture is worth a thousand words, so why not try something simple with box and line diagrams? Or else go further and easily build dynamic 3D illustrations and special effects. It's as simple or as powerful as you want it to be.

<a title="Database engine" href="http://www.libreoffice.org/features/base/">BASE</a> is the database front-end of the LibreOffice suite. With Base, you can seamlessly integrate into your existing database structures. Based on imported and linked tables and queries from MySQL, PostgreSQL or Microsoft Access and many other data sources, you can build powerful databases containing forms, reports, views and queries. Full integration is possible with the in-built HSQL database.

<a title="Equation editor" href="http://www.libreoffice.org/features/math/">MATH</a> is a simple equation editor that lets you lay-out and display your mathematical, chemical, electrical or scientific equations quickly in standard written notation. Even the most-complex calculations can be understandable when displayed correctly. E=mc2.

LibreOffice is the free power-packed Open Source personal productivity suite for Windows, Macintosh and Linux. LibreOffice is the perfect choice for home users, businesses, government and other organizations. It's native file format is the ISO standardized ODF (Open Document Format), but LibreOffice can open and save Microsoft Word, PowerPoint and Excel files, as well as many other formats, bringing you the widest-available compatibility with other products.

LibreOffice - The Document foundation

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