Backerkit - The missing back-end for your crowdfunding campaign.
Hacker News Stack - Focus on the really fresh and unread news in Hacker News.
Magination - Magination is like a deck of cards with magnets!
HackerWeb - A simple and readable Hacker News app
Backer News - Fresh crowdfunding projects
Hacker News Front Page Explorer - A database of top ranking Hacker News front page posts