Planets is a fun, interactive program for many-body gravity simulations. The emphasis is on play: it's easy to add in planets, zoom in and out, change the physical constants, save and load configurations, etc. It's designed to be easy enough for a kid to enjoy, but that hardly precludes adults.
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.
Generally, mod_ocaml is a flexible apache module for use of INRIA's powerful OCAML interpreter as a Web scripting language (with functional and imperative features). Simply embed OCAML code between HTML on your pages, like you do with PHP, mod_perl, etc. After modifying some settings, you can use almost any interpreter for providing dynamic content on your HTML pages.
SKS (Synchronizing Key Server) is a full-featured replacement for the standard PKS OpenPGP Key Server. It matches all of PKS features and interfaces, and at the same time provides a highly efficient, gossip-based replication algorithm that ensures that the replication is complete.
CIL is a frontend for the C programming language which facilitates program analysis and transformation. CIL will parse and typecheck a program, and compile it into a simplified subset of C. For example, in CIL, all looping constructs are given a single form and expressions have no side effects. This reduces the number of cases which must be considered when manipulating a C program. CIL has been used for a variety of projects, including CCured, a tool which makes C programs memory safe. It supports ANSI C, as well as most of the extensions of the GNU C and Microsoft C compilers. A Perl script acts as a drop-in replacement for either gcc or Microsoft's cl, and allows merging of the source files in your project. Other features include support for control-flow and points-to analyses.
Cameleon is an integrated development environment for Objective Caml and eventually other languages. Its features include a graphical user interface, configuration management based on CVS, easy access to and browsing of documentation, various editors, customizable file types, a plug-in architecture, and a highly customizable interface.