RSVPify - A powerful and awesomely customizable platform for selling tickets online for your event.
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Evite - Send online invitations for all occasions by email or text message. Create invites for birthdays, baby showers, save the dates, or customize your own design.
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JustRSVP.me - Online Invitations and response tracking for weddings, baby showers, birthdays, parties, and other...
Whoozin.com - Free RSVP Online | Track RSVP’s and Sell Tickets for your events and recurring meetings.