Inspiration on project-based webapps [on hold]

I'm having trouble designing my navigation structure for a web application with both an overview page (list of projects) and a details page (one project) with many sub-pages.

Any ideas on how to handle that? Or useful inspiration? I was looking at different git repository providers (GitHub, GitLab, Bitbucket) as well as Jira and Assana. But none of them provide an ideal solution for my problem. Any other (web) apps I should check out?

Thanks