EIDoS

Does a good job at keeping the game moving without sacrificing too much downtime activity opportunities. Makes reasonable rules decisions depending on the current situation where they may not normally apply. Makes adjustments to encounters where they make sense for the current party strength and composition.

Works well with players and strives to provide a good time.

This is finally a proper evolution to the d20 system that Dungeons and Dragons 3rd edition laid out. It actually streamlines it a bit and opens up new combinations and options while keeping things balanced. All of this while being able to access the rules system easily and free online. With the addition of Starfinder 2 utilizing the same engine, the possibilities are endless.

Flexible GM and allows for spontaneous role play during the campaign.

Good use of setting the mood with descriptions, images, maps and sounds (music, sound effects, voices, etc.) Allows the story to progress smoothly without characters feeling rushed through explorations or roleplay.