Hi~
HSPlugins is a pack containing useful plugins for the game such as HS2PE, NodesConstraints, Timeline, and more.
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It's basically the same NodesConstraints you're familiar with, but it comes with a bunch of other stuff. Some of these plugins were included in previous versions of BR (HS2PE), some are newer ports from HS1 to HS2 (Timeline).
I'll suggest you to use that newer repack instead of each plugins separately, as it is much easier to deal with if you're doing plugin updates manually.