Alfred or QuickSilver
These popular apps both offer similar functionality: they enable you to replace many of the commands you’d normally perform with a mouse using the keyboard. Alfred (alfredapp.com) and QuickSilver (qsapp. com) can move files, search your contacts, perform system commands (such as Sleep or Empty Trash). They offer a huge range of extra functionality, but both take some learning. Keen OS X users swear by the productivity gains acquired by taking some time to learn about their extensive capabilities.