Nightler - Find the people. Live the night.
SmallDevTools - Handy developer tools with a delightful interface
Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Discotech - Opentable for nightlife. Tickets, guest lists, and VIP.
Profitable developer tools database - A database of 103+ hand-curated profitable developer tools