Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
RSVPify - A powerful and awesomely customizable platform for selling tickets online for your event.
Bigtent - BigTent is a web-based organization and communication portal for groups.
JustRSVP.me - Online Invitations and response tracking for weddings, baby showers, birthdays, parties, and other...
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.
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.