Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
dbTribe - Get booked in a bar. Book a band in your bar. Get informed if a band is booked in a nearby bar.
AND CO - AND CO helps freelancers, entrepreneurs and other small businesses run their business smarter.
GigMasters - Event marketplace for booking live music artists, DJs, photographers and more.
Coworkly - Coworkly is a free tool for creative contractors to put freelance bookings, payments, & work goals on auto-pilot!It's a portfolio, scope of work, & invoice bundled into one simple flow that allows clients to reserve your time in a few easy steps.
Fyre - On-demand platform for celebrity booking.