Texpad
Alexander A. Alemi.
When I was at Google, I had a problem. We used GSuite tools for everything, Slides for presentations, Docs for docs, Chat for communication, and none of these tools had great LaTeX support.
So, I rolled together a simple utility: texpad.alexalemi.com
It's a single static page that uses MathJax to let you live-edit a LaTeX formula and renders it as a PNG that you can copy and paste into basically any web app. This works with Chat, Slack, Slides, Docs, etc and has been indispensible to me over the years.

It uses your browser local storage to store the last 100 or so equations you've entered, and you can click on those to restore them. It will also use local storage to store a persistant preamble. You can adjust the foreground and background color as well as the scale. I find scale = 3 useful for presentations. If your curious, the github repo is also available.
I thought I'd share. Enjoy.