Yes, both Slack and Quire offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Quire is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for Quire Starts at $8/member/month when 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 Quire includes Quickbase , Smartsheet, ClickUp, Zoho Projects, Trello, Wrike, TeamGantt, Asana, Teamwork, ProjectManager.com, Kanboard, Kanbanize, Quick Base, Zenkit Projects and Kanban Tool.