The Coherent PDF Command Line Toolkit provide a robust, professional set of tools for manipulating PDF files. The operations it offers includes split and merge, linearize, encrypt, scale, rotate, crop, bookmark, stamp, watermark, annotate, attach, and much more. It's based on the camlpdf library.
Liquidsoap is a powerful tool for building complex audio streaming systems, typically targetting Internet radio stations. It consists of a simple script language, which has a first-class notion of source (basically a stream) and provides elementary source constructors and source compositions from which you can build the streamer you want. There is no constraint on the streams, in contrast to many other tools which can only stream one file after another. Moreover, it is not restricted to a single stream. Finally, it interfaces well with external tools.
GLCaml is an Objective Caml interface for OpenGL versions 1.1, 1.2, 1.3, 1.4, 1.5, 2.0, and 2.1, plus extensions. It is intended as a compact drop-in binding. It is a direct, dynamic binding to OpenGL. An OCaml SDL binding is provided as well, along with texture-map scaling functions, texture mip-map generators, and a bitmapped font library. Extensive documentation and more than 20 examples are provided.
GNUdap is a project to build a userspace driver to interface Linux with proprietary-protocol USB MP3 players and mass storage devices. Currently, GNUdap supports only the "Perstel,Inc. CHIC MP10". GNUdap is also an experiment to test the advantages of a strongly-typed programming language and of the functional programming paradigm in hardware development. GNUdap currently supports all features supported by the official program provided with the Chic, and has some additional features, like being able to transfer MP3s directly to the PC.
The primary goal of ChartPak is to provide an easy-to-use library for dynamically generating statistical and financial charts for the Web. It will include a wide variety of common chart types (pie charts, bar charts, etc.), and may eventually provide support for more specialized types of graphics.
Mp3tag is an Objective-Caml library for reading and writing ID3v1 and v2 tags in MP3 files. It includes mp3tag tools, which can be used to modify tags in MP3 files or rename files according to their tags, and a cddbtag tool that modifies tags by using a CDDB server to retrieve information about the track.
Active-DVI is a DVI previewer and a programmable presenter for slides written in LaTeX. The previewer features color anti-aliasing, inclusion of images with alpha channel and blending, encapsulated Postscript file inclusion, Gpic specials to display pictures, correct treatment of many inlined-Postscript specials, page background settings, and Japanese pTeX DVI extension support. To present your DVI files, it features basic effects for presentation (pause, delay, dynamic text color change), annotations displayed on demand (similar to pop-up balloons), hyperlinks from slide to slide or to other files, replay of previously recorded parts of the display, text movements, page transitions, embedded applications, and scratching on slide to interactively modify the text on screen. Its special effects are set and launched from within your LaTeX source file via the macros of the advi.sty LaTeX package provided by the distribution. In addition, Caml hackers can program new and fancy Active-DVI effects in the source code of the presenter.