PylotLight is a cross-platform, themeable, plugin-supporting system for general computing tasks. It is comparable to QuickSilver, which you may recognize if you use a Mac. Current plugins exist for Web searches, Firefox bookmark launching, filesystem browsing and managing, subversion control, terminal control, and more.
JImageView an image viewer with no extra features. It is essentially an image display plus a menu-bar which includes the following actions: Rotate (Clockwise, Counter Clockwise, Rotate Normal); Scale (Zoom In, Zoom Out, Zoom to fit, Zoom Normal); Mirror (Flip Horizontally, Flip Vertically, Flip Normal); Fullscreen display; Slideshow mode; and Print.
Booze is a game that can play a few variants of Shogi. Shogi is the national variation of chess for Japan. Booze features 3D graphics, a built in AI with a wide range of difficulties, and easily accessible documentation. It works on all major operating systems. The games Booze can currently play are Shogi, Tori Shogi, and Mini Shogi.
syren is a CLI file downloader somewhat similar to wget and aria2c. It features support for HTTP, HTTPS, and FTP, resumable downloads, HTTP proxy support (including CONNECT mode for HTTPS), LISP scripting support, a small reusable downloader library, a small, reusable, and fast LISP interpreter library, predictable console output suitable for parsing by frontends, cookie support, easy changing of UserAgent and Referer fields, POST method support, and more.