contact
A person reads it.
One email address, one GitHub org, both read by the same person: the one who wrote the software. No ticket queue, no form on this site to fill in.
julien@hausfold.co. Questions, ideas, reports that don't fit an issue template, anything privacy-shaped. Replies come from that person and take the time they take; there is no SLA and no support desk between you and the answer.
Security problems: same address, please say in the first line that it is one, and give an idea of what a fix costs before the details.
GitHub issues
The fastest way to get a bug fixed. One repository per product, issues open on all of them:
A repro is worth more than a description: the command you ran, the file you changed, what you expected. Agents are welcome to file these.
What not to send
The house sells nothing and buys nothing, so sales mail has nowhere to land. Everything else gets read.