Punchbowl - A party planning and greeting card website
Pingg - Pingg is an online e-cards and invitation maker and invitation sending platform.
RSVPify - A powerful and awesomely customizable platform for selling tickets online for your event.
Zoji - As claimed by the developers of this Zoji, it caters online tools to aid you plan activities off-line.
Whoozin.com - Free RSVP Online | Track RSVP’s and Sell Tickets for your events and recurring meetings.
Anyvite - Anyvite provides an efficient way to create invitations, with a range of tools necessary to organize and communicate with attendees throughout the event lifecycle