🔔 Please also check the Mapfile editors page

Since MapServer 6.0 you can use the built-in OpenLayers viewer.

Minimalistic HTML viewer for UMN MapServer mapfiles in simple standalone WSGI server.

• Works for MapServer < 6.0
• Doesn't require web server running on Your machine. It creates its own WSGI server which is more like a development environments should look like (Django dev server).
• Usable debug messages in console
• Possibilities to override CONNECTION setting - in production one can use different credentials than in development.
• Possibility to override some other parameters line EXTENT. It creates possibility to work with many projects with the same base mapfile. More overriding options to come.
• Simple mapfile syntax check tool

Download: https://github.com/imincik/mapfile-viewer

QGIS mapfile viewer plugin.

QGIS plugin repository: http://build.sourcepole.ch/qgis/plugins.xml

Source code: https://github.com/sourcepole/qgis-mapfile-tools