reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.
Nightler - Find the people. Live the night.
scr.im - Don't share your email on public sites.
Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
hCaptcha - Do you use a captcha to keep out bots? hCaptcha is a drop-in replacement for reCAPTCHA that earns website owners money and helps companies get their data labeled.
Discotech - Opentable for nightlife. Tickets, guest lists, and VIP.