Sort of. The last Palm OS, webOS, was supposed to go open source in 2012 under HP's stewardship. LG then bought the product and now, webOS is finally open source and available. It's still an ancient OS that probably no one wants to use, but it's the thought that counts. Oddly, LG still uses webOS in their products.
I loved the Palm Treo4 that was my first smart phone. Nice for nostalgia sake at least.
I had one of those.