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.
RSVPify - A powerful and awesomely customizable platform for selling tickets online for your event.
Partey.io - Invite to parties and events. Dead simple, privacy-first. Just send a link to your friends. No accounts needed!
Online-RSVP.com - Beautiful online RSVP for wedding & other events. Create an online invitation, track your guests responses.
Push Party - Push Party is an exclusive, invite-only social network