Runa Capital, a VC firm, maintains a list of "Awesome open-source alternatives to SaaS". When looking further, this is specifically a list of start-up companies to a specific criteria that likely works to their investment focus.
This list contains a mix of many non-Open-Source products/companies. I raised this in a GitHub issue but as of writing there's been little intent to update the list. The fact that some of the projects/companies, in question, are also investments of Runa Capital may be a point of hesitation.
Runa Capital also publish Open Source specific lists, such as this one, which contain similar points of confusion.
Edit: Runa continue to push non open source via their "ross" lists. Claim they follow "commercial" open source instead of "orthodox" which makes this fine, but they won't define their definition/line for what counts. One of the projects listed is not even source available, many are quite restrictive (No commercial).