BleachBit deletes junk to recover disk space and maintain privacy. It rids your system of old junk including cache, Internet history, temporary files, unused locale files (better than localepurge), logs, and cookies. Designed for Linux systems, it wipes clean 50 applications including Adobe Reader, Bash, Firefox, Flash, OpenOffice.org, Opera, Real Player, Skype, and more. It shreds files so that they cannot be recovered, and it wipes free disk space to hide insecurely deleted files. It offers both a simple PyGTK GUI and a command line interface for automation.
JLearnIt is a thematic dictionary that allows you to learn vocabulary with a questionnaire. You can also translate text (word by word), search for incomplete words, sort the languages in alphabetical order, rearrange the order of the languages, save your score, save as HTML, and show only the languages you're interested in. Each word is rated according to frequency of use. You can choose to see only the words of a certain range of frequencies or to be asked for words of that level. You can also add and delete your vocabulary and categories, and cut/copy/paste between a spreadsheet program and JLearnIt. You can change the language and the skin of JLearnIt. You can get more information about the word on the Internet and save your configuration. JLearnIt won't ask you the same word if you know the word. It won't ask you for the word that starts with the same letters as the translation. You can edit words and set properties for this word.
Kiwix is an offline reader for Web content. It was designed for use with Wikipedia, but is potentially suitable for all HTML content. It supports the ZIM format, a highly compressed open format with additional meta-data. It is intended for use in schools, universities, and libraries which can't afford broadband Internet access. It features a full text search engine, bookmarks and notes, an HTTP server, PDF/HTML export, a user interface in more than 80 languages, tabbed navigation, and an integrated content manager and downloader.
Crabgrass is social networking, group collaboration, and network organizing Web application. It consists of a solid suite of group collaboration tools such as private wikis, task lists, a file repository, and decision making tools. Work is currently being done on a large user interface overhaul, better social networking tools, blogs, and event calendars, as well as better support for collaboration and decision making among independent groups.