Meetinch Attend - Your personal RSVP tracking assistant
Online-RSVP.com - Beautiful online RSVP for wedding & other events. Create an online invitation, track your guests responses.
IGdm - Instagram direct messaging on your laptop
RSVPify - A powerful and awesomely customizable platform for selling tickets online for your event.
Picatic - Picatic encourages event organizers to create a custom website, sell tickets and then determined their cost of use. Selling out events is easy with Picatic.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets