Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.
HeySpace - HeySpace is the only free task and simple project management software with communication and collaboration feature.
CheckFlow.io - Simple process and workflow management software using powerful checklists. Create recurring checklists, workflows and standard operating procedures.
Rivers IM - Simple, fast & secure team collaboration platform
Nifty - Manage projects, work, and communications in one place.
P2 - Share, discuss, and collab with your team. By Wordpress.