The enterprise-class Open Source LDAP server for Linux. It is hardened by real-world use, is full-featured, supports multi-master replication, and already handles many of the largest LDAP deployments in the world. OpenLDAP and Fedora Directory Server were both derived from the original University of Michigan slapd project. In 1996 the original developers of slapd became Netscape employees and developed Netscape Directory Server, which is now Fedora Directory Server. Its features include:
<ul><li> Multi-Master Replication, to provide fault tolerance and high write performance
</li><li> Scalability: thousands of operations per second, tens of thousands of concurrent users, tens of millions of entries, hundreds of gigabytes of data
</li><li> The codebase has been developed and deployed continuously by the same team for more than a decade
</li><li> Extensive documentation including helpful Installation and Deployment guides
</li><li> Active Directory user and group synchronization
</li><li> Secure authentication and transport (SSLv3, TLSv1, and SASL)
</li><li> Support for LDAPv3
</li><li> On-line, zero downtime, LDAP-based update of schema, configuration, management and in-tree Access Control Information (ACIs)
</li><li> Graphical console for all facets of user, group, and server management
</li></ul>

The enterprise-class Open Source LDAP server for Linux. It is hardened by real-world use, is full-featured, supports multi-master replication, and already handles many of the largest LDAP deployments in the world. OpenLDAP and Fedora Directory Server were both derived from the original University of Michigan slapd project. In 1996 the original developers of slapd became Netscape employees and developed Netscape Directory Server, which is now Fedora Directory Server.

389 Directory Server - Powerful OpenSource LDAP

Zabbix is an enterprise-class open source distributed monitoring solution. It is highly scaleable, capable of monitoring more than 100,000 devices and servers. A Zabbix agent can also be installed on UNIX and Windows hosts to monitor statistics such as CPU load, network utilization, disk space, etc. It also supports agentless monitoring via SNMP, TCP and ICMP. It monitors performance in real time and alers users via mail, SMS, Jabber (XMPP) clients. It supports variety of database including Oracle, MySQL, PostgreSQL, SQLite. Web based interface to visualize the data and generate reports and stats.

Zabbix is an enterprise-class open source distributed monitoring solution. It is highly scaleable, capable of monitoring more than 100,000 devices and servers. A Zabbix agent can also be installed on UNIX and Windows hosts to monitor statistics such as CPU load, network utilization, disk space, etc. It also supports agentless monitoring via SNMP, TCP and ICMP.

Zabbix - distributed monitoring solution

The original uClinux (you-see-linux) was a derivative of Linux 2.0 kernel intended for microcontrollers without Memory Management Units (MMUs). However, the Linux/Microcontroller Project has grown both in brand recognition and coverage of processor architectures. Today's uClinux as an operating system includes Linux kernel releases for 2.0 2.4 and 2.6 as well as a collection of user applications, libraries and tool chains. uClinux is mostly used in Embedded and Gaming device. uClinux is ported to Cisco routers, Motorola, Intel and many other devices and microcontrollers. 
 Sourceforge location: <A HREF="http://sourceforge.net/projects/uclinux/" target="_blank">http://sourceforge.net/projects/uclinux/</A>

The original uClinux (you-see-linux) was a derivative of Linux 2.0 kernel intended for microcontrollers without Memory Management Units (MMUs). However, the Linux/Microcontroller Project has grown both in brand recognition and coverage of processor architectures. Today's uClinux as an operating system includes Linux kernel releases for 2.0 2.4 and 2.6 as well as a collection of user applications, libraries and tool chains. uClinux is mostly used in Embedded and Gaming device.

uCLinux - Embedded Linux

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

SmoothWall is a open source Firewall distribution. It Supports LAN, DMZ, and Wireless networks, Static Ethernet, DHCP Ethernet, PPPoE, PPPoA using various USB and PCI DSL modems. It provides traffic stats, POP3 email proxy with Anti-Virus, Web proxy for accelerated browsing and lot more.

SmoothWall - Express Open Source Firewall Project

FreeIPA is an integrated Identity and Authentication solution for Linux/UNIX networked environments. A FreeIPA server provides centralized authentication, authorization and account information by storing data about user, groups, hosts and other objects necessary to manage the security aspects of a network of computers. 

FreeIPA - Identity and Access Management for Linux

The Yocto Project is an open source collaboration project that provides templates, tools and methods to help you create custom Linux-based systems for embedded products regardless of the hardware architecture. It's a complete embedded Linux development environment with tools, metadata, and documentation - everything you need. 

Yocto Project - Create Custom Linux Distribution

QuickLZ is the world's fastest compression library, reaching 308 Mbyte/s per core. It supports Streaming mode for optimal compression ratio of small packets down to 200 - 300 bytes in size. 

QuickLZ - Fastest Compression Library in C, C# and Java

Raspbian is a free operating system based on Debian optimized for the Raspberry Pi hardware. An operating system is the set of basic programs and utilities that make your Raspberry Pi run. However, Raspbian provides more than a pure OS: it comes with over 35,000 packages, pre-compiled software bundled in a nice format for easy installation on your Raspberry Pi. 

Raspbian - Operating System for Raspberry Pi hardware

Kamailio (successor of former OpenSER and SER) is an open source implementation of a SIP Signaling Server. SIP is an open standard protocol specified by the IETF. The core specification document is RFC3261.
 
The Kamailio SIP server is designed for scalability, targeting large deployments (e.g. for IP telephony operators or carriers, which have a large subscriber base or route a big volume of calls), but can be also used in enterprises or for personal needs to provide VoIP, Instant Messaging and Presence. Kamailio is well known for its flexibility, robustness, strong security and the extensive number of features.
 
Among the powerful features: asynchronous TCP, UDP and SCTP, secure communication via TLS for VoIP (voice, video, text); WebSocket support for WebRTC; IPv4 and IPv6; SIMPLE instant messaging and presence with embedded XCAP server and MSRP relay; asynchronous operations; IMS extensions for VoLTE; ENUM; DID and least cost routing; load balancing; routing fail-over; accounting, authentication and authorization; support for many backend systems such as MySQL, Postgres, Oracle, Radius, LDAP, Redis, Cassandra, MongoDB, Memcached; Json and XMLRPC control interface, SNMP monitoring.

Kamailio (successor of former OpenSER and SER) is an open source implementation of a SIP Signaling Server. SIP is an open standard protocol specified by the IETF. The core specification document is RFC3261.

Kamailio - The Open Source SIP Server

Sheepdog is a distributed object storage system for volume and container services and manages the disks and nodes intelligently. Sheepdog features ease of use, simplicity of code and can scale out to thousands of nodes. The block level volume abstraction can be attached to QEMU virtual machines and Linux SCSI Target and supports advanced volume management features such as snapshot, cloning, and thin provisioning.
 
The object level container abstraction is designed to be Openstack Swift and Amazon S3 API compatible and can be used to store and retrieve any amount of data with a simple web services interface.

Sheepdog is a distributed object storage system for volume and container services and manages the disks and nodes intelligently. Sheepdog features ease of use, simplicity of code and can scale out to thousands of nodes. The block level volume abstraction can be attached to QEMU virtual machines and Linux SCSI Target and supports advanced volume management features such as snapshot, cloning, and thin provisioning.

Sheepdog - Distributed Storage System for QEMU

projectM is an OpenGL based advanced music visualization program for Linux, Mac OSX, and Windows. It is backward compatible with all the features of Milkdrop 1.x (and now 2.x), but has many new toys and enhancements.

projectM - Awesome music visualizer

Openswan is an IPsec implementation for Linux. It has support for most of the extensions (RFC + IETF drafts) related to IPsec, including IKEv2, X.509 Digital Certificates, NAT Traversal, and many others. It has been the de-facto Virtual Private Network software for the Linux community since 2005. If you are running Fedora, Red Hat, Ubuntu, Debian (Wheezy), Gentoo, or many others, it is already included in your distribution.

Openswan - IPsec implementation for Linux

Darktable is a virtual lighttable and darkroom for photographers: it manages your digital negatives in a database and lets you view them through a zoomable light table. It also enables you to develop raw images and enhance them.It supports all basic image operations, Color corrections, watermark, split toning and lot more. 

Darktable  - Virtual Lighttable and Darkroom

GNU `gettext' is an important step for the GNU Translation Project, as it is an asset on which we may build many other steps. This package offers to programmers, translators, and even users, a well integrated set of tools and documentation. Specifically, the GNU `gettext' utilities are a set of tools that provides a framework to help other GNU packages produce multi-lingual messages. These tools include a set of conventions about how programs should be written to support message catalogs, a directory and file naming organization for the message catalogs themselves, a runtime library supporting the retrieval of translated messages, and a few stand-alone programs to message in various ways the sets of translatable strings, or already translated strings. A special GNU Emacs mode also helps interested parties in preparing these sets, or bringing them up to date.

Usually, programs are written and documented in English, and use English at execution time for interacting with users. Using a common language is quite handy for communication between developers, maintainers and users from all countries. GNU `gettext' is an important step for the GNU Translation Project.

Gettext

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