Pepperfilters - Pepper's Snapchat Geofilter creator allows you to easily create a custom snapchat geofilter for your birthday, wedding or event.
Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Vidcode - Build your own Snapchat filters with code
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Snapcode Stickers - Promote your Snaps with stickers
pretix - pretix helps you to sell tickets for your event in an easy way. It supports multi-lingual events and provides a wide range of features