Browsers

Remove and block overlays / annotations on Youtube videos

Mac OS X

Precise control of volume, screen and keyboard brightness

Mac OS X

Play sound on multiple devices, including Internal Speakers, on OS X

AppleScript & Automation

Great backup control with TimeMachine Scheduler

AppleScript & Automation

Create and control TimeMachine backup schedule with TimeMachineEditor

Applications / Software

Prevent auto-capitalisation of i.e. in Scrivener

Mac OS X

Start and Stop OS X web server

Applications / Software

Special Characters like em dash in Firefox