List of Switch Accessible Games and Activities you can run on your Web Browser:
HelpKidzlearn: The subscription $99 per year for 1 user or $219 for a site. If you create an account you can play 10 games for free as much as you like.
Papunet http://papunet.net/games/games They have games similar to angry birds that work with switches. Some games available that just work on attention and looking. Can be customized.
Tar Heel Reader has lots of free switch accessible content, it has synthesized text reader, available in multiple languages, and has current age appropriate topics created by users and teachers http://tarheelreader.org/ look for Tar Heel books on everything from Presidents’ Day to Lady Gaga and Taylor Swift!
Hiyah http://hiyah.net/online.htm has powerpoint-like books all made that you can advance with a button press. All subjects.
ShinyLearning http://www.shinylearning.co.uk/freegames/ more silly games.
Specialties http://www.specialbites.com/ More Games and some blog type content. Downloadable slideshows (switch accessable) They also adapted some popular meme/videos with a timed play (Charlie bit me!!! ).
Some kids could use a switch in google docs and record voice to text. http://stealthswitch3.com/applications/
If you have a programmable switch interface (like stealth switch) you can use a switch as a shortcut for something. Here is a list of keyboard shortcuts that work in Chromebooks to program into a switch input https://support.google.com/chromebook/answer/183101?hl=en