The Simple Sockets Library makes sockets easy to use and comes as public domain source code. It resembles C's file I/O, uses whatever port is available, has named servers and port reuse, streaming/blocking sockets used, polling support, blocking/selection support via numerous functions, timeout control and firewall support.
image-deduplication-tool is a script designed to scan specified paths and calculate the DCT hashes of all the images there. It compares the hashes to find closest-looking image pairs, despite various alternations (such as crop, rotation, gamma/color correction, noise, etc.), optionally presenting them in a feh image viewer for the operator to easily compare and remove one of the versions. It uses libpHash to produce and compare perceptual hashes.
pulseaudio-mixer-cli is an interactive ncurses UI to control the volume of PulseAudio streams. It is somewhat like alsamixer, but focused not on sink volume levels (which can actually be controlled via alsamixer, with the alsa-pulse plugin), but rather on the volume of individual streams from applications, allowing the user to balance sound levels between them. Interaction with pulseaudio is done through the DBus interface, and the UI is designed to be as simple as possible, without heavy DE dependencies like GNOME libs or KDE/QT.
blindRSS is a very simple browser-operated RSS reader. You can click through the feeds in a sidebar, use the (hopefully self-explanatory) icons next to them to manipulate them, and do all the other stuff a RSS reader should do. It's programmed so that the feeds are reread by a cronjob or daemon, while as much functionality as possible is done within the client. Thus, the server only serves the data, not the markup.
Felix is a programming language with a fully featured purely functional subsystem embedded in a a traditional Algol-like imperative programming system. The system features garbage collection, static typing, parametric polymorphism, overloading, regular expression matching, and a lot more. A scripting harness is used to invoke source files, but fully compiled binary shared libraries are generated, yielding both rapid prototyping and high performance. Seamless binding of C/C++ code makes interfacing existing libraries easy. Control inversion provides language-level cooperative multi-tasking.
Devilspie2 is a utility to find windows and changes properties of these windows with the help of rules written in LUA. For example, you can make a window of an application always appear at the same screen position each time it starts. It is a continuation of the program Devilspie, written by Ross Burton.
The PDM library aids in inspecting and managing Python programs running as daemons, allowing client programs to connect to the daemon process in order to interact with it in various ways. Primarily, it provides an interactive read-eval-print loop, and a non-interactive programmatic interface not entirely unlike Java's JMX.
mi is a Linux command line utility that can identify potential deadlocks in multi-threaded applications. It can also collect statistics such as number of successful and failed mutex operations, time spent acquiring mutex locks, etc. It can also show call stacks for all mutex operations. It is able to identify the following conditions: the order of locking two mutexes in one thread is opposite to the order of locking the same mutexes in another thread; unlocking a mutex that was not locked earlier; a mutex is left locked after an application has finished; the order of unlocking mutexes does not correspond to the reverse order of locking these mutexes; and unlocking a mutex that was locked earlier in another thread.
AMT REST API implements all the functionality available in the Amazon Mechanical Turk API natively in PHP. There are no external dependencies. The package requires PHP 5.3 or later and uses namespaces. Optional sub-packages handle worker qualifications and notifications sent by the AMT service. The source is intended to be used with the docblox automatic documentation system. An HTML manual cross-links the internal documentation with Amazon's API documentation.