MyBB

The MyBB forum plugin can be downloaded here.

If you find any bugs or have any suggestions please use the GitHub issues page to report them.

PHPBB

There is a free plugin for phpBB 3.1.x available here.

PunBB

The PunBB forum plugin can be downloaded here.

If you find any bugs or have any suggestions please use the GitHub issues page to report them.

Question2Answer

There is a premium plugin for Question2Answer by Q2A Pro which is available here.

SMF

There is a paid plugin for SMF from SMFPacks here which is available here.

Plugin missing?

If you have have written a plugin for SCEditor and would like it listed here please let me know by sending an email to sam [at] sceditor.com.