Yes, both HourStack and Trello offer a Free Trial.
HourStack is designed for Medium Business and Small Business.
Trello is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for HourStack Starts at $9/Month when Billed Yearly whereas for Trello Starts at $5/User/Month when Billed Yearly.
Some top alternatives to HourStack includes Connecteam, ClickUp, Smartsheet, TimeCamp, TrackingTime, TimeTrack, Busy, Timebase, TeamTime, Sunsama, Tack, Timet and TimeTackle.
Some top alternatives to Trello includes ClickUp, Smartsheet, Miro, Process Street, Wrike, Notion, HubSpot CRM, Freshbooks, Jira, Basecamp, Zoho Projects, monday.com, Asana, Teamwork, ProjectManager.com, Microsoft Project, Worksuite, Trackboard, Quick Base, Todoist, Resource Guru and Height.