Numa Player

Great instrument. A range of pianos, electric pianos, organs, synth keys, marimba, strings and choirs. The pianos and organs have great attack portions and less successful sustains sounding quite synthy. The strings and vocal patches are more like a synth version from the early 2000s.

If you're looking for pianos, this is not Pianoteq or even T2L Piano out of the box. They would work for staccato pieces or buried fairly deep in a mix. The organs and electric pianos are better because they have a simpler sustain.

They have an add on (Stage D) piano @ €99 (€49 black friday) which is a lot better quality. To my ear it sounds less full and darker than the pianoteq NY Steinway D. The pianoteq version also seems to resonate in a more natural way. Stage D is on the same par at least with dynamics handling: pizzicato passages are great. The normal price for Stage D is 2/3 of the lowest cost option for pianoteq which includes two pianos or Dexibell's T2L Piano which comes with eight pianos. It still might be worth it for an extra piano flavor, if you're a piano nut like me.

They seem to use a similar technique to Dexibell: sampled attacks and modeled sustains. From examples installed with Numa Player, it seems Dexibell do it better with acoustic pianos but Pianoteq outperforms both.

Numa player is free. The included instruments are fair quality and a large range and definitely useful in a mix.

It works well on Linux.