OpenTaxSolver (OTS) is a free program for calculating Tax Form entries and tax-owed or refund-due, such as Federal or State personal income taxes. Two optional graphical front-ends exist, OTS_GUI and OTS_tclgui-0.0. TaxSolver has been updated for the most recent 2006 tax-year for: US 1040 and Schedules A, B, C, & D, ...