I like craft.do for teams with casuals on them, it allows you to make team spaces. It’s markdown based and also has incredibly frictionless online sharing.
For technical teams, you can hook your obsidian markdown folders to a multi-party savvy file sync system, e.g. git, there are extensions for this. Then it plays nice with, for example, team members using VS Code as well. You can match the markdown, linking, tagging, etc., using VSCode plugins, or by carefully matching options between them, you can have some people in Obsidian and some people in VSCode + Foam.
Using obsidian+git is definitely possible, but it doesn't really get to the seamless collaborative feel that I'm looking for. Looking into Notion again, it seems like they've imported more ideas from Roam et al. and might be worth another look.
For technical teams, you can hook your obsidian markdown folders to a multi-party savvy file sync system, e.g. git, there are extensions for this. Then it plays nice with, for example, team members using VS Code as well. You can match the markdown, linking, tagging, etc., using VSCode plugins, or by carefully matching options between them, you can have some people in Obsidian and some people in VSCode + Foam.