For getting friends together
RSVPify.com simplifies the challenge of planning a group dinner or other event. Like most of the other sites on this list, it generates a survey or invitation form associated with a unique URL so you can distribute the form to potential participants and collate the replies.
Google.com/Forms can handle RSVPs, too, and also offers a wide variety of templates for surveys, quizzes, and questionnaires.
Doodle.com asks invitees to select from a calendar so an event coordinator can quickly see which dates and times work best.
Rallly.co is a great no-frills RSVP gatherer. There’s no need to register, and as with Doodle, guests can vote on dates.
JotForm.com grants you full control over the appearance of your online invitations. Premium plans cost between $19 and $99 a month. Otherwise, you’re limited to five gorgeous forms and 100 guest submissions each month.