Jira may be extremely sluggish and require a large amount of memory on the client side.
Markdown Viewer - Markdown document viewer. Allows to visualize formatted markdown documents in browser.
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
Markdown Preview for (Neo)vim - Preview markdown on your modern browser with synchronized scrolling and flexible configuration.
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.
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.
Wrike - Wrike is a flexible, scalable, and easy-to-use collaborative work management software that helps high-performance teams organize and accomplish their work. Try it now.