The Valgrind distribution currently includes six production-quality tools: a memory error detector, two thread error detectors, a cache and branch-prediction profiler, a call-graph generating cache profiler, and a heap profiler. It also includes two experimental tools: a heap/stack/global array overrun detector, and a SimPoint basic block vector generator. It runs on the following platforms: X86/Linux, AMD64/Linux, PPC32/Linux, PPC64/Linux, and X86/Darwin (Mac OS X). 

Valgrind uses dynamic binary instrumentation, so you don't need to modify, recompile or relink your applications. Just prefix your command line with valgrind and everything works. Valgrind works with programs written in any language, be they compiled, just-in-time compiled, or interpreted. The Valgrind tools are largely aimed at programs written in C and C++, because programs written in these languages tend to have the most bugs! But it can, for example, be used to debug and profile systems written in a mixture of languages. Valgrind has been used on programs written partly or entirely in C, C++, Java, Perl, Python, assembly code, Fortran, Ada, and many others.

Valgrind is an award-winning instrumentation framework for building dynamic analysis tools. There are Valgrind tools that can automatically detect many memory management and threading bugs, and profile your programs in detail. You can also use Valgrind to build new tools.

Valgrind

Redmine is a flexible project management web application. Written using Ruby on Rails framework, it is cross-platform and cross-database. Its feature include:
 	<ul>
		<li>Multiple projects support</li>
		<li>Flexible role based access control</li>
		<li>Flexible issue tracking system</li>
		<li>Gantt chart and calendar</li>
		<li>News, documents &#38; files management</li>
		<li>Feeds &#38; email notifications</li>
		<li>Per project wiki</li>
		<li>Per project forums</li>
		<li>Time tracking</li>
		<li>Custom fields for issues, time-entries, projects and users</li>
		<li>SCM integration (SVN, CVS, Git, Mercurial, Bazaar and Darcs)</li>
		<li>Issue creation via email</li>
		<li>Multiple LDAP authentication support</li>
		<li>User self-registration support</li>
		<li>Multilanguage support</li>
		<li>Multiple databases support</li>
	</ul>

Redmine is a flexible project management web application. Written using Ruby on Rails framework, it is cross-platform and cross-database.

Redmine - Project Management system in Ruby

Asterisk, converts an ordinary computer into a feature-rich voice communications server. Asterisk makes it simple to create and deploy a wide range of telephony applications and services, including IP PBXs, VoIP gateways, call center ACDs and IVR systems. It is maintained by Debian VoIP Team. 

 Asterisk supports a wide range of protocols for the handling and transmission of voice over traditional telephony interfaces including H.323, Session Initiation Protocol, Media Gateway Control Protocol, and Skinny Client Control Protocol. Asterisk merges voice and data traffic seamlessly across disparate networks. 

 It has drivers for VoIP protocols and PSTN interface cards and devices. It routes both inbound and outbound calls. Call details and duration are logged for billing. Calls could be recorded and monitored. It recognizes speech and converts to text. LDAP integration is provided for corporate security. It stores all information in a relational database. 

 Asterisk has support of IVR, Conference bridge, Automated attendant, Call Queuing, Call Recording, Call Retrieval, Caller ID Blocking, SMS Messaging, VoIP Gateways and lot more. 
	
 Hardware requirement: Asterisk requires no additional hardware. It turns an ordinary computer into a communications server. It runs on GNU/Linux, OpenBSD, FreeBSD, and Mac OS X. 
 
 API Support: External call management is possible in any programming or scripting language through Asterisk Gateway Interface.

Asterisk, converts an ordinary computer into a feature-rich voice communications server. Asterisk makes it simple to create and deploy a wide range of telephony applications and services, including IP PBXs, VoIP gateways, call center ACDs and IVR systems. It is maintained by Debian VoIP Team.

Asterisk - IP telephony commuincation product suitable for call center

Jahia is a open source Enterprise Content Management System. It supports Content Management, Document Management, Wiki, Blog, Forum, Social networking, Workflow, Document search, Federated Search, Multilingual, Multi Site Management, Mobile Apps etc.

Jahia - Enterprise Content Management in Java

Inkscape is a vector graphics editor, with capabilities similar to Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format. It supports many advanced SVG features (markers, clones, alpha blending, etc.) and great care is taken in designing a streamlined interface. It is very easy to edit nodes, perform complex path operations, trace bitmaps and much more.

Inkscape - Vector Graphics Editor

OpenVPN is a full-featured open source SSL VPN solution that accommodates a wide range of configurations, including remote access, site-to-site VPNs, Wi-Fi security, and enterprise-scale remote access solutions with load balancing, failover, and fine-grained access-controls. With OpenVPN, you can tunnel any IP subnetwork or virtual ethernet adapter over a single UDP or TCP port, use real-time adaptive link compression and traffic-shaping to manage link bandwidth utilization and lot more.

OpenVPN - open source SSL VPN solution 

CUBRID is a relational database management system highly optimized for Web Applications, especially when complex web services process large amount of data and generate huge concurrent requests. CUBRID is being developed in C/C++. Includes HA, online incremental backup, Replication, Load balancing, Sharding, Caching and other features. It supports JDBC, PHP, ODBC/.NET, Ruby & Python APIs.

CUBRID - RDBMS Optimized for Web

OpenVAS is a framework of several services and tools offering a comprehensive and powerful vulnerability scanning and vulnerability management solution. It is designed to search for networked devices and computers, discover accessible ports and services, and to test for vulnerabilities on any such ports; plugins allow for further expansion.

OpenVAS - Vulnerability Scanner and Manager

BusyBox combines tiny versions of many common UNIX utilities into a single small executable. It provides replacements for most of the utilities you usually find in GNU fileutils, shellutils, etc. The utilities in BusyBox generally have fewer options than their full-featured GNU cousins; however, the options that are included provide the expected functionality and behave very much like their GNU counterparts. BusyBox provides a fairly complete environment for any small or embedded system.

BusyBox - The Swiss Army Knife of Embedded Linux

Unicorn is an HTTP server for Rack applications designed to only serve fast clients on low-latency, high-bandwidth connections and take advantage of features in Unix/Unix-like kernels. Load balancing is done entirely by the operating system kernel. Requests never pile up behind a busy worker process. Does not care if your application is thread-safe or not, workers all run within their own isolated address space and only serve one client at a time for maximum robustness.



Unicorn - Rack HTTP server for fast clients and Unix

PostGIS is a spatial database extender for PostgreSQL object-relational database. It adds support for geographic objects allowing location queries to be run in SQL. PostGIS adds extra types (geometry, geography, raster and others) to the PostgreSQL database. It also adds functions, operators, and index enhancements that apply to these spatial types. 
 
 
Its features include 
<ul>
<li>Processing and analytic functions for both vector and raster data for splicing, dicing, morphing, reclassifying,
and collecting/unioning with the power of SQL</li>
<li>raster map algebra for fine-grained raster processing</li>
<li>Spatial reprojection SQL callable functions for both vector and raster data</li>
<li>Support for importing / exporting ESRI shapefile vector data via both commandline and GUI packaged tools and support for more formats via other 3rd-party Open Source tools</li>
<li>Packaged command-line for importing raster data from many standard formats: GeoTiff, NetCDF, PNG, JPG to name a few</li>
<li>Rendering and importing vector data support functions for standard textual formats such as KML,GML, GeoJSON,GeoHash and WKT using SQL </li>
<li>Rendering raster data in various standard formats GeoTIFF, PNG, JPG, NetCDF, to name a few using SQL</li>
<li>Seamless raster/vector SQL callable functions for extrusion of pixel values by geometric region, running stats by region, clipping rasters by a geometry, and vectorizing rasters</li>
<li>3D object support, spatial index, and functions</li>
<li>Network Topology support</li>
</ul>

PostGIS is a spatial database extender for PostgreSQL object-relational database. It adds support for geographic objects allowing location queries to be run in SQL. PostGIS adds extra types (geometry, geography, raster and others) to the PostgreSQL database. It also adds functions, operators, and index enhancements that apply to these spatial types. 

PostGIS - Spatial and Geographic objects for PostgreSQL

SoftEther VPN is a ?Cross-platform Multi-protocol VPN Program. It supports SSL-VPN protocol to penetrate any kinds of firewalls. Ultra-optimized SSL-VPN Protocol of SoftEther VPN has very fast throughput, low latency and firewall resistance. Virtualization of Ethernet devices is the key of the SoftEther VPN architecture. It virtualizes Ethernet devices in order to realize a flexible virtual private network for both remote-access VPN and site-to-site VPN.
 
Its feature include: 
<UL>
<LI>Easy to establish both remote-access and site-to-site VPN.</LI>
<LI>SSL-VPN Tunneling on HTTPS to pass through NATs and firewalls.</LI>
<LI>Revolutionary VPN over ICMP and VPN over DNS features.</LI>
<LI>Ethernet-bridging (L2) and IP-routing (L3) over VPN.</LI>
<LI>Embedded dynamic-DNS and NAT-traversal so that no static nor fixed IP address is required.</LI>
<LI>AES 256-bit and RSA 4096-bit encryptions.</LI>
<LI>The OpenVPN clone function supports legacy OpenVPN clients.</LI>
<LI>RADIUS / NT Domain user authentication function.</LI>
<LI>Deep-inspect packet logging function.</LI>
</UL>

 SoftEther VPN is a ?Cross-platform Multi-protocol VPN Program. It supports SSL-VPN protocol to penetrate any kinds of firewalls. Ultra-optimized SSL-VPN Protocol of SoftEther VPN has very fast throughput, low latency and firewall resistance. Virtualization of Ethernet devices is the key of the SoftEther VPN architecture. It virtualizes Ethernet devices in order to realize a flexible virtual private network for both remote-access VPN and site-to-site VPN.

SoftEther VPN - Cross-platform Multi-protocol VPN Program

Pandoc is a Haskell library for converting from one markup format to another, and a command-line tool that uses this library. Pandoc can read Markdown, CommonMark, PHP Markdown Extra, GitHub-Flavored Markdown, MultiMarkdown, and (subsets of) Textile, reStructuredText, HTML, LaTeX, MediaWiki markup, TWiki markup, TikiWiki markup, Creole 1.0, Haddock markup, OPML, Emacs Org mode, DocBook, JATS, Muse, txt2tags, Vimwiki, EPUB, ODT, and Word docx.
 
Pandoc can write plain text, Markdown, CommonMark, PHP Markdown Extra, GitHub-Flavored Markdown, MultiMarkdown, reStructuredText, XHTML, HTML5, LaTeX (including beamer slide shows), ConTeXt, RTF, OPML, DocBook, JATS, OpenDocument, ODT, Word docx, GNU Texinfo, MediaWiki markup, DokuWiki markup, ZimWiki markup, Haddock markup, EPUB (v2 or v3), FictionBook2, Textile, groff man, groff ms, Emacs Org mode, AsciiDoc, InDesign ICML, TEI Simple, Muse, PowerPoint slide shows and Slidy, Slideous, DZSlides, reveal.js or S5 HTML slide shows. It can also produce PDF output on systems where LaTeX, ConTeXt, pdfroff, wkhtmltopdf, prince, or weasyprint is installed.

Pandoc is a Haskell library for converting from one markup format to another, and a command-line tool that uses this library. Pandoc can read Markdown, CommonMark, PHP Markdown Extra, GitHub-Flavored Markdown, MultiMarkdown, and (subsets of) Textile, reStructuredText, HTML, LaTeX, MediaWiki markup, TWiki markup, TikiWiki markup, Creole 1.0, Haddock markup, OPML, Emacs Org mode, DocBook, JATS, Muse, txt2tags, Vimwiki, EPUB, ODT, and Word docx.

Pandoc - Universal markup converter

ejabberd is a distributed, fault-tolerant technology that allows the creation of large-scale instant messaging applications. The server can reliably support thousands of simultaneous users on a single node and has been designed to provide exceptional standards of fault tolerance. As an open source technology, based on industry-standards, ejabberd can be used to build bespoke solutions very cost effectively.

ejabberd - Robust, Scalable and Extensible XMPP Server

GraalVM is a universal virtual machine for running applications written in JavaScript, Python 3, Ruby, R, JVM-based languages like Java, Scala, Kotlin, and LLVM-based languages such as C and C++. GraalVM removes the isolation between programming languages and enables interoperability in a shared runtime. It can run either standalone or in the context of OpenJDK, Node.js, Oracle Database, or MySQL. 


Graal - High-Performance Polyglot VM 

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