Jira may be extremely sluggish and require a large amount of memory on the client side.
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.
Mutt - Mutt is a small but very powerful text-based mail client for Unix operating systems.
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.
Alpine - Alpine is a fast, easy to use email client that is suitable for both the inexperienced email user...
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.
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.