Slony-I is a "master to multiple slaves" replication system with cascading and failover. Slony-I is a system designed for use at data centers and backup sites, where the normal mode of operation is that all nodes are available. 

Slony-I - Replication System for PostgreSQL

UnQLite is a in-process software library which implements a self-contained, serverless, zero-configuration, transactional NoSQL database engine. UnQLite is a document store database similar to MongoDB, Redis, CouchDB etc. as well a standard Key/Value store similar to BerkeleyDB, LevelDB, etc.
 
UnQLite is an embedded NoSQL (Key/Value store and Document-store) database engine. Unlike most other NoSQL databases, UnQLite does not have a separate server process. UnQLite reads and writes directly to ordinary disk files. A complete database with multiple collections, is contained in a single disk file. The database file format is cross-platform, you can freely copy a database between 32-bit and 64-bit systems or between big-endian and little-endian architectures.

UnQLite is a in-process software library which implements a self-contained, serverless, zero-configuration, transactional NoSQL database engine. UnQLite is a document store database similar to MongoDB, Redis, CouchDB etc. as well a standard Key/Value store similar to BerkeleyDB, LevelDB, etc.

UnQLite - Transactional Embedded NoSQL Database Engine

Modular ASIC/FPGA miner written in C, featuring overclocking, monitoring, fan speed control and remote interface capabilities.

bfgminer - Bitcoin miner 

libuv is a multi-platform support library with a focus on asynchronous I/O. It was primarily developed for use by Node.js, but it’s also used by Luvit, Julia, pyuv, and others. Its feature includes event loop backed by epoll, kqueue, IOCP, event ports.
Asynchronous TCP and UDP sockets, 
Asynchronous DNS resolution, Thread pool, Signal handling and lot more.

libuv - Cross platform Asynchronous I/O

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

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

Seafile is a full-fledged document collaboration platform. Its features include Groups with file syncing, wiki, discussion and tasks, Managing files into libraries, Each library can be synced separately,
Sync with existing folders, File revisions, Library encryption with a user chosen password.


Seafile - File Syncing and Collaboration for Teams

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

LZ4 compression for Java, based on Yann Collet's work available at http://code.google.com/p/lz4/. This library provides access to two compression methods that both generate a valid LZ4 stream fast scan (LZ4) and high compression (LZ4 HC). The streams produced by those 2 compression algorithms use the same compression format, are very fast to decompress and can be decompressed by the same decompressor instance.

lz4-java - LZ4 compression for Java

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

libssh2 is a client-side C library implementing the SSH2 protocol. 

Libssh2 -  Client-side C library implementing the SSH2 protocol

HandBrake is a tool for converting video from nearly any format to a selection of modern, widely supported codecs. It converts video from nearly any format. Handbrake can process most common multimedia files and any DVD or BluRay sources that do not contain any kind of copy protection. 

Handbrake - The open source video transcoder

The nanomsg library is a simple high-performance implementation of several "scalability protocols". These scalability protocols are light-weight messaging protocols which can be used to solve a number of very common messaging patterns, such as request/reply, publish/subscribe, surveyor/respondent, and so forth. These protocols can run over a variety of transports such as TCP, UNIX sockets, and even WebSocket.  It aims to make the networking layer fast, scalable, and easy to use. 

nanomsg - High Performance Messaging Library

Sumatra PDF is a free PDF, eBook (ePub, Mobi), XPS, DjVu, CHM, Comic Book (CBZ and CBR) reader for Windows. Sumatra PDF is powerful, small, portable and starts up very fast.

Sumatrapdf - PDF, CHM, XPS, DjVu, CBZ and CBR viewer for Windows

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

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