Mockingbird – web-based program that lets you quickly create application mock-ups and share them.
Twitcleaner – find and purge bots, spammers, and low-value people from your stream
Myfonts – three tools in one! first, new fonts; second, a font finder; and third, fonts sorted by categories (like script or funny)
Trello – a virtual project “bulletin board”, good for people (like me) who think visually. Much better than reading a project spreadsheet.
What are your favorite productivity and project tools?