Here is the forum-thread I found this editor. (V1.3)
Supported Games:
- Mega Man X (U) (V1.1) (older version works but newest is recommanded)
- Mega Man X 2 (U) [!]
- Mega Man X 3 (U) [!]
Here a github-page with a earlier version. (V1.0)
I know very little about it but did think it is worth sharing here. Please let me know if you find a nice guide on the tool!
Here the docs shared on the github along some notes on events and how to use the editor. (here is some documentation on a similar editor..)
Staff/Credits:
pianohombre, Xeeynamo
Relevant link: https://github.com/rbrummett/megaedx_v1.3
File download: