Yes, both TaxCalc and Phabricator offer a Free Trial.
TaxCalc is designed for Large Enterprises, Medium Business and Small Business.
Phabricator is designed for Medium Business and Small Business.
The starting price of Phabricator begins at $20/User/Month, while pricing details for TaxCalc are unavailable.
Some top alternatives to TaxCalc includes Easy Accountax, QuickFile, AccountingSuite, Saasu, autoTax, TaxDome, AccountsIQ, Qualified, Workvivo, Traxit, TaxJar and TaxAdda PMS.
Some top alternatives to Phabricator includes Jira, Assembla, Jira Service Desk, GitHub, GitLab, Qualified, AnalyticsVerse, Workvivo, CodeSee, SaaS Forge, GetGit and Bitbucket.