Punchbowl - A party planning and greeting card website
Send Me Color! - With Send Me Color! you can send a hint to your contacts that will look like color card.
Whoozin.com - Free RSVP Online | Track RSVP’s and Sell Tickets for your events and recurring meetings.
Partey.io - Invite to parties and events. Dead simple, privacy-first. Just send a link to your friends. No accounts needed!
JustRSVP.me - Online Invitations and response tracking for weddings, baby showers, birthdays, parties, and other...
Push Party - Push Party is an exclusive, invite-only social network