I happened upon this virtual piano package and I think it's pretty good - and it's free.
https://www.studiologic-music.com/products/numaplayer/
Studiologic's Numa Player
Yes, it's quite surprising that they made this free... especially on iOS. You could plug in any MIDI keyboard to your phone/tablet and get a nice range of sounds without any trouble.
It has a nice Musette.
And surprisingly, it even lets you layer the various engines. I'd always wished Pianoteq would let me layer some strings on top of the piano sounds... and this free Numa Player just does it no problem.
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Beach L168, Wish, baCh, WOW Petrof, Fake Steinway, VS
TIME
navindra Another thing about this collection of instruments is that it is only 320mb - that's megabytes, not the usual gigabytes that most virtual pianos take up. Very tweak-able, but quite usable from the presets as is. I think it would be impressive if it were just a grand piano. But to have several pianos, one being an upright, and the Rhodes, Wurlitzer, Pads, Strings, Clavinet, etc. for free, with no registration, no hoops to jump through, didn't even ask for an email, it pretty amazing.
Rob Why running side by side? Isn't pianoteq just superior, while Numa is free?
I installed Numa yesterday and played with it. I like the sound. But still I prefer to play with my piano internal sounds because there is less latency. (Windows PC) The lag isn't dramatic and Numa is playable, hands down. But there is still some lag.
WieWaldi Hey, Wie! I'm running Numa on a macbook and have 5ms latency, which to me, is imperceptible. On Windows, I always used ASIO4All, instead of the Microsoft built-in driver, had very low latency, maybe 7ms. In the ASIO4ALL control panel, there are settings to change the latency vs buffer size - lower buffer = less latency. Buffer too low = crappy sound. Buffer too high = unplayable. Hope this helps.
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PianoMonk Thanks, this ASIO-driver is valuable info. Actually I didn't plan to change from internal sound to Numa or another VST. I enjoy sitting in front of the Piano, press the ON-button, put on my headphones. It allows me to play piano within 3 seconds, whenever I want. No need to switch on my PC, or start a program, and no distractions from a computer.
Playing Numa was just for fun after I connected the piano to the PC for recording a virtual keyboard, three days ago. Maybe I will record the sound via Numa. But for sure, I will continue to listen to the intern piano sound via headphone as always.
I don't like to install drivers on my Windows, if not really necessary. Windows is not really famous for its stability. If I have a little lag in my videos, it is not noticable. And in the video-editing phase I could fix it easily.
btw: You call me "Wie", lovely but stange. WieWaldi is not something like a forname/surname combi. I named my YouTube channel "Klavierspielen Wie Waldi". It translates into "Clavierplaying Like Woody". In Bavaria, Waldi is a typical name for a dog if the dog-owners are old and uncreative. So my avatar should look like a dog... Well - a piano playing dog was preferred. And fun fact on top, when Germans say the two words "wie Waldi", it sounds exactly like Vivaldi. (I love my nickname, haha.)
This is the reason I always smirk when you shorten my name with "Wie" (like "Like"), because this isn't the name-part of my nick. But a Waldi alone feels all right. You know, Waldi is a name. Ok, only a name for dogs. Especially Dackel- the Baravian term for Dachshund. But still, Waldi is a name. 
On one day in a very distant future, (after I finished learning piano), I should learn something from The Four Seasons. Probably Spring, because this is the absolute best known movement of Antonio. But classical music is so difficult compared to Blues. Don't expect me playing Vivaldi too soon.
WieWaldi Oh! I had no idea Iād made such a faux pas. I did see the Vivaldi connection, but was ignorant as to the roots of your moniker. I like your playing and your postings, and I guess I felt a little too familiar addressing you. I meant no disrespect.
Yes, some days I wish I could just sit down and play. My Yamaha p35 has a sound that I can only listen to for a few minutes, very uninspiring, if not, eventually, annoying. So, I use a PC or Macbook. My PC takes exactly 14 seconds to boot, and my Macbook is usually on, so 2 or 3 seconds to have something to play.