Commandline Challenge - Test your command line skills
Viral Rails Course - Build the prelaunch campaign used by Harry's Shave Club
nodo - Manage your daily tasks in the command line
Dumper - Dumper enables you to dump selected SQL Server tables and save them as local .sql files containing data for a duplicate table or for backup.
Prompt - Prompt provides fully-integrated writing education solutions, combining instruction, curriculum, and feedback. We support educational institutions, companies, and individuals.
Codecademy's Learn Rails - Codecademy's new learning interface now teaches you Rails