We just launched a new site www.pokergtosolution.com, you can find complete preflop game tree solutions for 6max 100bb cash game; for the first time and at the lowest price of the market you can find GTO strategy specifically calculated for 50NL and 100NL Pokerstars.com/es/fr rake structure, instead of NL500z available up to now.
During last years rakeback has been cut down near to 0% and optimal preflop play is affected really hard by rake structure, as you can see in the picture below:
For this launch period, we're offering a free SBvsBB solution calculated for NL50 and NL100 Pokerstars.com rake, more details available on the site,
Plans are to add new trees and rake structures (i.e. Pokerstars.es/fr and Pokerstars.it)
Feel free to ask any question/request!