ff3sudoku is an add-on that features an engine for playing Sudoku puzzles. It can generate random puzzles, but it also detects and imports Sudokus from several Web sites, including websudoku.com, sudokupuzz.com, sudoku.com.au, and others. There is also a stand-alone version working in Firefox 3+ and GoogleChrome.
"fgallery" is a static photo gallery generator with no frills that has a stylish, minimalist look. It shows your photos, and nothing else. There is no server-side processing, only static generation. The resulting gallery can be uploaded anywhere without additional requirements and works with any modern browser.
file2password is a utility that allows you to select a file (picture, document, music, etc.) and generate a secure password based on it. This means that there is no need to remember any password - just a picture or a filename. It is small (2 KB plus CSS), highly secure as it does not upload or shows the file used, supports drag and drop, can use online storage, and requires no server-side scripting.
Foodsoft is online software for a non-profit food coop. It features a product catalog, order cycle management, accounting, and tasks. A food cooperative is a group of people that buy food from suppliers of their own choosing; a collective do-it-yourself supermarket. Members order their products online and collect them on a specified day, and all put in a bit of work to make that possible. foodsoft facilitates the ordering and administration.