Solus is an independently developed Linux operating system for PCs, not based on another distribution. It offers a rolling release: updates reach the stable repository weekly after testing, so no reinstallation is needed. Budgie is the default desktop environment, and there is also a traditional Xfce edition for older hardware, among others. Packages are managed with eopkg. According to its developers, Solus is meant for personal computers, not for enterprise or server use. You download the image and install it yourself.
Solus is open source, mainly under GPLv2 and Apache licences, and is run by volunteers funded by donations through OpenCollective. Its privacy statement names no legal entity or country. The package mirror cdn.getsol.us is served through Cloudflare, the homepage and repositories are on GitHub, and the chat rooms are on the Matrix.org homeserver. For a European organisation this means the software itself is fully open and can be run locally, while the distribution infrastructure relies on US-based services.