Pingg - Pingg is an online e-cards and invitation maker and invitation sending platform.
Zoji - As claimed by the developers of this Zoji, it caters online tools to aid you plan activities off-line.
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
Paperless Post - Paperless Post is an online platform for creating custom card and invitations.
PurpleTrail - Whether it is about birthday or wedding party or holidays, you just need to name the event and PurpleTrail will provide you the apt invitation solutions.
Punchbowl - A party planning and greeting card website