Yes, both Slack and TeamGantt offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
TeamGantt is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for TeamGantt Starts at $19/Month when Billed Yearly.
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 TeamGantt includes Smartsheet, Miro, Process Street, Wrike, Notion, ManagePro, monday.com, Teamwork, ProjectManager.com, Microsoft Project, GanttPRO, Instagantt, ProWorkflow, Quick Base, GoodGantt, ClickUp and Gantt.io.