Guestboard - Lead powerfully-organized group events with Guestboard – a modular event platform that gives groups of 10-1000+ people a central space to coordinate, build excitement, and save money. No more crazy email threads. No more massive group texts.
Paperless Post - Paperless Post is an online platform for creating custom card and invitations.
Mobilizon - A free and federated tool to get our events off Facebook
Pingg - Pingg is an online e-cards and invitation maker and invitation sending platform.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Manvite - As the name of this service suggests, the users can avail easily and simply invite rather than online summons that are blessed with flowery fonts and dabbling champagne glasses.