Yes, both Slack and Sentry offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Sentry is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Slack begins at $2.67/Month, while pricing details for Sentry are unavailable.
Some top alternatives to Slack includes Microsoft Teams, Glip, Google Chat, ChatWork, Dialog, Office Chat, imBee, Takle, SPACE Channel and Teamwork Chat.
Some top alternatives to Sentry includes The Bug Squasher, Bugsnag, Zoho BugTracker, Rollbar, TrackJS, BugHost, Bug-Track.com, Disbug, Hawk and Crash Catch.