EverSave
Tool allows you to save all of your documents — if possible — in a specific time interval or by changing the frontmost application. Accessible from the menubar, with lots of options for applications and documents.
ForeverSave Lite
For those programs without an autosave feature, ForeverSave comes to the rescue. Features include Save All, hotkeys and an application assistant that defines how, when and what to save.
SaveCircle
Autosave your work at time intervals you select. Choose to save the frontmost app or any other that is running.