The best free version of a table manager I know is Jurojin: https://jurojinpoker.com
You can use it without limitations for free if you play micro stakes (up to NL10 in cash games or up to $5 MTTs).
Beyond that you will experience some limitations, but I believe it is still a good choice.
Some table organizers are built into the Caption series 888Caption, Starscaption, Partycaption. 888Caption, PartyCaption seem to stay in unlimited demo mode, means free on up to NL 10 cashgame and buyins for tournaments up to $3. StarsCaption does not have this option.
Find them under www.pokercaption.com