Qminder - Qminder works the way it sounds: It helps a company mind its queues.
Buzzerr - Make queue management effortless with Buzzerr
Zenlist - Google ads for classifieds
FlexQ - Beyond a queue management system, Flexq is a unique solution that helps you reinvent the customer journey.
Zeplo.io - Message queue as service.
Spacebring - The coworking space management platform in a pocket