This one might be overkill, but it has a ton of features - https://tabletpro.com/. Source: about 1 year ago

Check out Tablet Pro, you make a side dock and can put as many customisable buttons on it as you like. Source: about 1 year ago

I haven't used Tablet Pro in a couple of years, but it worked well to have a few touchscreen shortcuts while sketching or writing with a stylus. Source: about 1 year ago

Users run https://tabletpro.com etc to get around the keyboard/touch limitations. Source: over 1 year ago

Tablet Pro is a windows app that creates shortcuts on the touch screen. Is there any app that does the same on Linux? Source: over 1 year ago

You might be better off trying to ask questions about the universe on https://stackexchange.com/ instead of the r/askreddit.com subreddit. Source: 11 months ago

Stolen from stackexchange.com: "A parallel universe would be a completely separate universe, possibly containing similar characters or facts, but definitively a separate entity. An alternative universe would likely take place in the same universe, but with altered facts (i.e., "what-if" scenarios).". Source: about 1 year ago

Https://www.wolframalpha.com/ is your best friend. This thing solves all math problems like a beast. Also embrace the vulnerability and ask a lot of questions on stackexchange.com. Source: about 1 year ago

This is seriously featured on page 1 of https://stackexchange.com/. - Source: Hacker News / about 1 year ago

You probably already know that you can program LibreOffice, but as you are asking specifically about an API: I can't comment on LibreOffice's API, sorry, as I've never used it. You might find some help on LibreOffice's forum, or you might be lucky on Ubuntu Forums or Stack Exchange, specifically Unix & Linux. Source: over 1 year ago