screenity

Take a look at https://screenity.io/en/, which is also fully open-source here: https://github.com/alyssaxuu/screenity While a Chrome Extension (not a standalone app), it does a fabulous job of recording system audio and input, and also gives a ton of additional features like annotations, etc. Records to localstorage, and lets you export to a variety of 3rd party platforms (I can't remember if S3 is supported OOTB, but that shouldn't be too hard). I've used it mainly with GDrive, as most of our team lives there, so this has been a seamless way to store and share videos without lock-in at Loom. I recommend this to most folks who need a quick way to replace Loom, and even meeting recorder tools.