cygbuild is a porting tool for making Cygwin net releases. It helps Cygwin source and binary package maintainers to configure, build, strip, produce diffs, and generate Cygwin specific files. To put it simply, it converts any freely available program or package into a complete Cygwin net release distribution.
easy-rsa is a small RSA key management package based on the OpenSSL command line tool. While it is primary concerned with key management for the SSL VPN application space, it can also be used for building Web certificates. It was originally included as part of OpenVPN, but is now a separate project.
Rescatux is a GNU/Linux rescue CD that comes with Rescapp, a nice wizard that will guide you through your rescue tasks. It can restore Grub to the MBR update a Grub configuration, perform filesystem checks, fix a Windows MBR, and more. Features that can indirectly assist the rescue process include chat programs to let you reach human online help, a share log (automatic pastebin), and a share log that uses formatting appropriate for posting on a forum.
BlueSense SDK is a software development kit for communicating with BlueSense equipment. It allows you to read out sensors or control actuators. A user-space USB driver for all platforms is included. Examples for all modules are also included. For Java and Mono/C#, there is an object-oriented interface, and for C, there is a function based interface.
Autojump is a tool that acts as a complement to cd: it makes navigating your filesystem a lot faster. It works by automagically maintaining a database of the directories you use the most from the command line, and allows you to jump back and forth between them, by typing just a few letters of the name of the directory you want to jump to. It works for Linux, Mac, and Cygwin under Windows.