Yes, both Slack and TestMonitor offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
TestMonitor is designed for Medium Business, Small Business and Freelancers.
The starting price of Slack begins at $2.67/Month, while pricing details for TestMonitor 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 TestMonitor includes and undefined.