Traggo is a tag-based time tracking tool. In Traggo there are no tasks, only tagged time spans. (Source Code).

An open source time-tracker based on an interactive timeline and powerful reporting. (Demo, Source Code).

Modern time tracking application for freelancers and agencies. (Source Code).

Track work time and print out a summary of your activities on demand. (Demo, Source Code).

Open business management platform for collaborative, on-demand and sharing economies (ERP/CRM/HRM/ATS/PM). (Demo, Source Code).

Habit tracking app to save your precious moments in your fleeting life. (Demo).

Automatically track how you spend time on your devices. (Source Code).

Open-source Trello-like kanban. (Source Code).

The to-do app to organize your life. (Demo, Source Code).

Web-based application to help you implement David Allen’s Getting Things Done™ methodology. (Source Code).

Dev-first issue tracking tool (alternative to Jira, Linear). (Source Code).

Taskwarrior is Free and Open Source Software that manages your TODO list from your command line. It is flexible, fast, efficient, and unobtrusive. It does its job then gets out of your way. (Source Code).