Punchbowl - A party planning and greeting card website
RSVPify - A powerful and awesomely customizable platform for selling tickets online for your event.
Whoozin.com - Free RSVP Online | Track RSVP’s and Sell Tickets for your events and recurring meetings.
JustRSVP.me - Online Invitations and response tracking for weddings, baby showers, birthdays, parties, and other...
Stuff - A platform for invitations to private and public events.
PartyLabz - Create an elegant event website in minutes, send out invitations and collect RSVP online.