Guard is a command line tool to easily handle events on file system modifications.

Open-source Dropbox using Ruby and Git.

Wrapping of microstation using win32ole to automate and control from ruby

Watches source and spec files with Cruise and runs RSpec, showing Doom guy notifications based on test results.

Timeless comes with a pomodoro timer, with a standard stopwatch (start, top), semantic tags in notes (projects, clients, activites), and reporting and exporting command. Data is stored in csv and it can be easily imported into a spreadsheet.