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I'll update this if I find more. For now, this seems to be a partial solution. It's a Gmail add on (except I don't use Gmail) that adds reminders. The options when setting reminders include cancelling it if someone replies, and to remind everyone in the thread. If you combine those two, it seems like — if you use Gmail's web client and have $23/month you're dying to get rid of — a decent way to add the feature. 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: about 1 year 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
Gmelius - Gmelius is the first collaboration platform designed for G Suite and your company's daily tools.
Reddit - Reddit gives you the best of the internet in one place. Get a constantly updating feed of breaking news, fun stories, pics, memes, and videos just for you.
FollowUpThen - The simplest way to schedule an email reminder
Quora - Quora is a place to gain and share knowledge. It's a platform to ask questions and connect with people who contribute unique insights and quality answers.
Boomerang for Gmail - Boomerang for Gmail is a Firefox / Chrome plugin that lets you take control of when you send and receive email messages.
Stack Overflow - Community-based Q&A part of the Stack Exchange platform.