Software Development team leader with 17 years experience in industry. Coding since 8 years old. By day leading dev teams to deliver solutions for a University and by night building systems for fun.
Don't think it's specific for your requirements, but at work I use Atlassian's Confluence, which we have brought on prem (no reason not to use the cloud version, but it just made sense when looking at the licensing cost for us).
Confluence allows you to create product requirement pages, which then all our developers comment on with options, building threads of conversations and linking to gliffy diagrams of their proposals.
A free option that is perhaps similar but against issue tickets would be Redmine. I have used redmine historical tickets as refences to documentation before, but it has a wiki feature that I found very useful for team communication.
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Don't think it's specific for your requirements, but at work I use Atlassian's Confluence, which we have brought on prem (no reason not to use the cloud version, but it just made sense when looking at the licensing cost for us).
Confluence allows you to create product requirement pages, which then all our developers comment on with options, building threads of conversations and linking to gliffy diagrams of their proposals.
A free option that is perhaps similar but against issue tickets would be Redmine. I have used redmine historical tickets as refences to documentation before, but it has a wiki feature that I found very useful for team communication.