Free (libre) SSHD for Android? How can I install a sshd server (with scp support) on Android without relying on Google Play Store for my safety?

Rooting the device or compiling the application is not a problem, but so far I'm unable to find proper instructions. I don't need a GUI either, some kind of on/off switch would be nice tho, but that's not required.
As you already figured out, there's SSHelper hosting its own .apk. But you might also wish to check with F-Droid, and find out there are even more SSHd's to download without using Google Play Store.

Edit: As it turns out, I wasn't aware F-Droid also features forums, and the above are only forum links. To compensate: You can also find some SSH Server apps on 1mobile, e.g. SSH Server. The website allows you to simply download the .apk from your browser, no login required. Other than with F-Droid, I'm not sure concerning their reputation, though.

Apart from that: In my experience, it's always worth checking the resp. dev's website, where they sometimes host their own .apk files for download. If not, asking them helped me as well :)