Great little (free, beer) app for OSX that shows detailed battery information.
$5 app for OSX that pops up the iOS style cut copy paste options above any selected text. Supports an MIT licensed extension system. Might support auto-copying, if not, probably easy enough with an extension.
Software to control the colour temperature of screens based on the time of day. Available for linux/mac/windows. Yellower light is better for the human brain at night apparently. Seems to work.
Talks from TED conferences over the years.