ZDBSP

ZDBSP is ZDoom's internal node builder. It is available under the GNU GPL v2 as a standalone program, so people can use it for non-ZDoom projects.

ZDBSP features as of version 1.16:
 * Fast: it was designed to be potentially used every time a map is loaded
 * Polyobject-aware: it splits sectors in a way that minimizes or avoids altogether many polyobject glitches
 * Support for GL nodes (v2 and v5 only)
 * Support for extended and compressed nodes
 * Support for UDMF maps (the only UDMF-compliant nodebuilder available)
 * Support for maps with more than 65535 vertices after nodebuilding