At Rendevu (https://rendevu.co https://rendevu.co), we think the problem you're describing is due to Slack's (or any messaging app's) inherent synchronous natur

At Rendevu (https://rendevu.co https://rendevu.co), we think the problem you're describing is due to Slack's (or any messaging app's) inherent synchronous nature. We're building an intelligent asynchronous feed that aggregates discussions from all the other apps you already use (google / jira / trello / invision), and gives your team a one stop place to find info that doesn't go stale like a wiki. We're running an alpha right now at https://rendevu.co https://rendevu.co. Feel free to check it out if you get the chance.