Slack Jira Integration - Easily keep issues moving right from Slack
Sortd - Rated the #1 App for Gmail
Sortd for Slack - Get Trello-style project boards right in your Slack!
KanbanMail - A Kanban board for your emails.
Actions from Slack - Turn Slack messages into tickets, issues, tasks, and more.
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.