Is there an alternative to tmux/screen that would work on Windows with Powershell? I'm aware of Powerscreen, but it seems dead for a long time. Cygwin wouldn't work with Powershell, would it? Console2 is very poors man solution.
Any other thought?
You don't specify your requirements, so it's somewhat hard to answer your post.
You could try the free Console, which can incorporate PowerShell tabs :
For details see this article : Console – Windows Command Prompt alternative for Windows and PowerShell.
It's not precisely analogous to tmux or screen, but PowerShell has a facility for managing remote sessions. Ed Wilson wrote a blog post about it entitled Learn How to Manage Remote PowerShell Sessions, which might help. Also see the about_PSSessions PowerShell help topic.
Can you say more about what you're trying to accomplish?