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.
Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
Virtuagym - Virtuagym is a unique, all-in-one fitness solution tailor-made for fitness businesses of all sizes...
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.