CAMPR - Open source project management tool with 16 modules
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.
Confleo - Confleo is an all-in-one project management and CRM tool that allows you to create and manage multiple projects, assign multiple users within it, create stunning invoices for your clients and even accept payments from them through in-built payment g…
Colorkit - A productivity tool for color management for designers
Hygger - Hygger - is an Agile project management tool with built-in prioritization.
GoodGantt - The best Gantt chart for Trello®