Add: OpenProject (Open-Source software, but locks SSO behind Enterprise)

[samip5]

What is the vendor's name?
OpenProject

What is the vendor's pricing site?
https://www.openproject.org/pricing/

What is the base pricing? Use the lowest tier that looks sane for a small business customer, not free or personal tiers.
$7.25 per user/month

What is the minimum pricing for SSO support?
$7.25 x 5 users/month x 12 equals 435.00$/yr MIN

Does this pricing info come from a quote or other non-public source?
No, it comes from their official pricing

Are there any caveats we should list in the footnotes?
Requires a minimum of 5 users and only yearly subscription available for self-hosted.