PiP for Mac - Always on top window preview similar to the popular windows only OnTopReplica
reddit shell - Web-based shell for browsing reddit (pretend you're working)
Pennywise - Cross-platform application to open any website or media in a floating window
HiddenMe - Hide desktop icons with a single click.
Afloat - Create beautiful invoices in 3 clicks, without mistakes
Reddit App - The official app for Android & iOS. Meow.