Simple and handy overview of all shortcuts for any application. Easy to use: just press ⌘ twice and hold to see the list.
KeyClu's answer
The CheatSheet becomes not available, so here its successor.
KeyCue - Menu shortcuts are supposed to provide quick access to frequently used menu commands.
Hive - Seamless project management and collaboration for your team.
CheatKeys - View Windows keyboard shortcuts in the current application.
Sup! Standup Bot - The complete stand-up and follow-up bot
cheat - Cheat allows you to create and view interactive cheatsheets on the command-line.
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.