Oh that is good to know then. At a cursory glance I only saw the clients’ software available as github repositories and the German and French wikipedia pages called it a proprietary service.

Is there an open source implementation of kDrive as well?

I would assume (without having looked at the codebase) that if they use minio they are, by default, not reliant on AWS.

Minio is its own S3 implementation which can be self-hosted.

S3, being an AWS protocol originally has AWS environment variables all over the place but that does not necessarily mean a reliance on the service. Rather, they rely on the protocol and you bring your own S3 endpoint I would assume. be that minio, hetzner or what have you.

While that is a really nice list, and I will save it for the future - I don’t think OP was looking for Lemmy applications, seeing as they mention they are:

using Friendica Mastodon Sharkey, Pixelfed and bridgy with bluesky

Same, love rdddddddddtrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrc