Yes, both Jira and Assembla offer a Free Trial.
Jira is designed for Large Enterprises, Medium Business and Small Business.
Assembla is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Jira Starts at $6.25/User/Month when Billed Yearly whereas for Assembla Starts at $9.16/User/Month.
Some top alternatives to Jira includes Trello, Confluence, Asana, SwiftKanban, Kanbanize, ClickUp, Height, Kanban Tool, Kanban Zone and KanbanFlow.
Some top alternatives to Assembla includes Quickbase , Smartsheet, ClickUp, Zoho Projects, Jira, Wrike, TeamGantt, GitScrum, Teamwork, ProjectManager.com, Backlog, Axosoft, TaskBranch, Quick Base, Project.co and Height.