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

FSArchiver is a system tool that allows you to save the contents of a file-system to a compressed archive file. The file-system can be restored on a partition which has a different size and it can be restored on a different file-system. Unlike tar/dar, FSArchiver also creates the file-system when it extracts the data to partitions. Everything is checksummed in the archive in order to protect the data. If the archive is corrupt, you just loose the current file, not the whole archive.

FSArchiver - Filesystem Archiver for Linux

NaCl is a new easy-to-use high-speed software library for network communication, encryption, decryption, signatures, etc. NaCl provides a simple crypto_box function that does everything in one step. The function takes the sender's secret key, the recipient's public key, and a message, and produces an authenticated ciphertext.

NaCL - Networking and Crytography library

KubOS is light weight flight RTOS and framework, brings unparalleled productivity and functionality to the flight critical MCUs of satellites.

Kubos - A real-time operating system targeting microcontrollers in space

Psycopg is the most popular PostgreSQL database adapter for the Python programming language. Its main features are the complete implementation of the Python DB API 2.0 specification and the thread safety (several threads can share the same connection). It was designed for heavily multi-threaded applications that create and destroy lots of cursors and make a large number of concurrent "INSERT"s or "UPDATE"s.

Psycopg - Python PostgreSQL Database Adapter

DPDK is a set of libraries and drivers for fast packet processing. It was designed to run on any processors. The first supported CPU was Intel x86 and it is now extended to IBM Power 8, EZchip TILE-Gx and ARM. These libraries can be used to  receive and send packets within the minimum number of CPU cycles (usually less than 80 cycles), develop fast packet capture algorithms (tcpdump-like) and run third-party fast path stacks.


DPDK - Data Plan Development Kit

Tails is a live system that aims to preserve your privacy and anonymity. It helps you to use the Internet anonymously and circumvent censorship almost anywhere you go and on any computer but leaving no trace unless you ask it to explicitly. Tails relies on the Tor anonymity network to protect your privacy online. It encrypt and sign your emails and documents using the de facto standard OpenPGP either from Tails email client, text editor or file browser.

Tails - Live operating system which preserves privacy and anonymity

strongSwan is an OpenSource IPsec implementation. IPSec is an encryption and authentication standard that can be used to build secure Virtual Private Networks (VPNs). It has powerful IPsec policies supporting large and complex VPN networks. It implements both the IKEv1 and IKEv2 (RFC 7296) key exchange protocols. 

strongSwan - IPsec-based VPN Solution

SocialVPN is an open-source IPOP-based virtual network that connects your computers privately to your friends’ computers. It automatically maps online social network relationships using Jingle and XMPP to create your own user-defined peer-to-peer VPNs – with no hassle, and supporting unmodified TCP/IP applications. 
 
In the SocialVPN, each user is in control of who their VPN connects to. To scale to large online social networks, SocialVPN employs a unique dynamic IPv4 address allocation/translation approach that avoids conflicts with local networks and devices outside a user’s social network. creates a communication overlay that can be used as a basis to design decentralized Online Social Networks (OSNs). It keeps the data sharing private.

SocialVPN is an open-source IPOP-based virtual network that connects your computers privately to your friends’ computers. It automatically maps online social network relationships using Jingle and  XMPP  to create your own user-defined peer-to-peer VPNs – with no hassle, and supporting unmodified TCP/IP applications. 

SocialVPN - P2P VPN that connects you to your friends computer

open-vm-tools is a set of services and modules that enable several features in VMware products for better management of, and seamless user interactions with, guests. It includes kernel modules for enhancing the performance of virtual machines running Linux or other VMware supported Unix like guest operating systems.
 
<ul>
<li>The ability to perform virtual machine power operations gracefully.</li>
<li>Execution of VMware provided or user configured scripts in guests during various power operations.</li>
<li>The ability to run programs, commands and file system operation in guests to enhance guest automation.</li>
<li>Authentication for guest operations.</li>
<li>Periodic collection of network, disk, and memory usage information from the guest.</li>
<li>Generation of heartbeat from guests to hosts so VMware's HA solution can determine guests' availability.</li>
<li>Clock synchronization between guests and hosts or client desktops.</li>
<li>Quiescing guest file systems to allow hosts to capture file-system-consistent guest snapshots.</li>
<li>Execution of pre-freeze and post-thaw scripts while quiescing guest file systems.</li>
<li>The ability to customize guest operating systems immediately after powering on virtual machines.</li>
<li>Enabling shared folders between host and guest file systems on VMware Workstation and VMware Fusion.</li>
<li>Copying and pasting text, graphics, and files between guests and hosts or client desktops.</li>
</ul>

open-vm-tools is a set of services and modules that enable several features in VMware products for better management of, and seamless user interactions with, guests. It includes kernel modules for enhancing the performance of virtual machines running Linux or other VMware supported Unix like guest operating systems.

open-vm-tools - Official repository of VMware open-vm-tools project

OpenSwitch provides an abstraction of hardware devices of network switch platforms in a Linux OS environment. It uses standard open source software including an ONIE installer, and an unmodified Linux kernel based on Debian Jessie distribution. It provides an object-centric API for application development to implement custom applications using a well-defined object model, and set of programmatic APIs.
 
OPX Base software supports hardware virtualization (or simulation). Software simulation of basic hardware functionality is also provided (“white board”), and the higher layer software functionality can be developed and tested on generic PC/server hardware.

OpenSwitch provides an abstraction of hardware devices of network switch platforms in a Linux OS environment. It  uses standard open source software including an ONIE installer, and an unmodified Linux kernel based on Debian Jessie distribution. It provides an object-centric API for application development to implement custom applications using a well-defined object model, and set of programmatic APIs.

OpenSwitch - Linux-based network operating system (NOS) platform

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

s2n is a C99 implementation of the TLS/SSL protocols that is designed to be simple, small, fast, and with security as a priority. s2n implements SSLv3, TLS1.0, TLS1.1, and TLS1.2. For encryption, s2n supports 128-bit and 256-bit AES, in the CBC and GCM modes, 3DES, and RC4. For forward secrecy, s2n supports both DHE and ECDHE. 

s2n - an implementation of the TLS/SSL protocols from Amazon

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

Libdill is a C library that makes writing structured concurrent programs easy. There is no interaction between threads. Each thread is treated as a separate process. Channels are always unbuffered. Coroutines can be canceled. Generally speaking, though, libdill's concurrency primitives are only a bit slower than basic C flow control statements. A context switch has been seen to execute in as little as 6 ns, with coroutine creation taking 26 ns. Passing a message through a channel takes about 40 ns.

libdill - Structured concurrency in C

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