Kokopu is a JavaScript library for chess applications. It implements the chess game rules, and provides tools to read/write the standard chess file formats (PGN, FEN, etc.).

RPB Chessboard is a plugin for WordPress. It allows to typeset and display chess games and diagrams on posts and pages of WordPress blogs, using the standard FEN and PGN notations.

RPB Calendar is a plugin for WordPress. It allows to list and schedule events in WordPress blogs, and to display them in a calendar in a post or a page.

Virtual Chess Clock is a chess clock software: it turns your computer into a chess clock. VCC is designed to be easy to use. It is free, open-source and works both on Windows and on Linux.