Apronus.com hosts a collection of free, lightweight chess utilities that run entirely in the browser. Key tools include a PGN viewer and editor for annotating and replaying games, an animated GIF generator for creating chess animations from PGN, a puzzle editor for creating and sharing custom positions, and an FEN editor for setting up and analyzing positions.

The tools are no-frills and functional, designed for players who need a specific utility without the overhead of a full platform. The PGN editor is particularly useful for quick annotation and game preparation, and the animated GIF tool was one of the earlier options available for this purpose.

All tools are free and require no account. Apronus is a useful bookmark for players who need ad-hoc chess utilities that don’t warrant installing dedicated software.