Paco - Never miss a thing on Slack — be more calm and productive
Planning Poker by Standuply - Asynchronous planning poker via Slack task-based surveys
awesome - A dynamic window manager for the X Window System developed in the C and Lua programming languages.
Sprint Poker by Parabol - Remotely bring planning poker to life
Lowdown - Lowdown unleashes the valuable content locked within Slack and emails it to your members so they don't miss key information.
StoriesOnBoard - StoriesOnBoard helps agile teams build better products faster. The built-in guide helps you collect and prioritize ideas, understand user requirements, gather customer feedback, and validate feature ideas with internal & external stakeholders.