A low cost solution for z/OS is CVS for MVS (dccmn.com/cvsmvs). You can use it from USS-side via native CVS commands or via Batch-Job from TSO.
I wrote a ISPF-frontend in REXX for our needs to control the workflow-levels test, qualitycontrol, integration, production. This tool is for Mainframe developers without CVS-know-how and Mainframe COBOL-Sourcecode. Our MVS guys are very happy using CVS for MVS. Albert VERLAGSGRUPPE WELTBILD GMBH Sitz der Gesellschaft: Augsburg Handelsregister Augsburg HRB 6035 Ust-ID-Nr: DE 127501299 Geschäftsführung: Carel Halff (Vorsitzender), Dr. Klaus Driever, Werner Ortner, Herbert Zoch Vorsitzender des Aufsichtsrates: Dr. Klaus Donaubauer