Which tools can visualize subsectors (SSECTORS)?

[david_a]

The Doom Wiki page has a screenshot showing them in E1M1 but frustratingly no info on where it came from.  Can't one of the Doom Builder 2 variants also visualize them?

[Linguica]

Yes, the Nodes Viewer plugin in DB2 / GZDB shows subsectors.

[david_a]

Ah, excellent.  For future reference, that can be downloaded on the Doom Builder 2 site plugin page.  Put the DLL into the Plugins subfolder.  It seemed to work fine with Doom Builder X.