What do you all actually use in practice? Curious if there's something obvious, I'm missing.
Originally set it up to discuss patent stuff which had to be kept pretty secret, stayed for the lolz.
For small but sensitive items of data, such as bank details, I split over a couple of channels, eg SMS and email, to make it harder for any one bad actor to see all parts.
For actually sending, Signal disappearing messages or phone calls for some info.
You could eather host it yourself or use e.g. https://psono.pw, a free hosted instance of Psono. In regards of trust. Psono is audited every year and the company behind it is ISO27001 certified.