http://playism-games.com/ http://playism-games.com/ They mostly have games by Japanese developers; I suspect their Japanese version of the site has quite a few

http://playism-games.com/ http://playism-games.com/ They mostly have games by Japanese developers; I suspect their Japanese version of the site has quite a few more games, however they do have some games with English translations that do not appear on gog. I haven't actually purchased from them yet, mostly due to their cloudflare settings being fairly strict and often blocking my vpn/proxy (that only I use, but is in an IP address range that others use for vpn) so I am reluctant to use them even when it works. However, it is not so good if gog is the only DRM-free option either (I strictly avoid steam). I don't know of any others. Humble occasionally has bundles that have "DRM-free" options for most or all of the games (like the current indie bundle), although I am a little suspicious that their "DRM-free" might sometimes have call home DRM. However, I haven't investigated closely and most of the games I got from them have worked fine without an internet connection.