Things - Things is an easy to use task manager.
Workzone - Workzone is a web-based project management software.
Lunatask - All-in-one encrypted to-do list, habit and mood tracker, journaling and notes app
Motion Project Manager - Automate task planning and prioritization
Microsoft To-Do - Task management tool
Morgen.so - All-in-one Calendar, Tasks & Scheduler. Morgen is the single hub for everything that revolves around time management.