Things is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best Linux alternative is Todoist, which is free. If that doesn't suit you, our users have ranked more than 100 alternatives to Things and many of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Things are Super Productivity (Free, Open Source), Org mode (Free, Open Source), Remember The Milk (Freemium) and Amazing Marvin (Paid).
Projango is a visual workmanagement system, scrum tool and taskboard for agile teams using Scrum or Kanban. With Projango a team can track tasks very easy and by automatic realtime updates all boards, charts and statistics are always uptodate.
DayTasks lets you easily manage adding new tasks, removing tasks, marking tasks complete, archiving completed tasks to your done.txt file, and even filtering and searching through tasks in a simple way that lets you find certain projects or contexts easily.
A self-hosted open source system for the long-term management of personal information. It is a combination of a web-based application intended for desktop use, and an Android mobile reader application.
Mad Productivity offers a sleek and stylish but still work-focused take on task management. The native app provides note taking, to-dos, reminders and time tracking bundled in a fast and intuitive design.