| Name | Kind | Description |
| main | artifact | |
| mapping | relation | |
| mappings | relation | weak pointers |
| Mask | class | |
| mask | artifact | |
| merge activity node | merge activity node | |
| meta | artifact | |
| Meta | class | |
| mobject | artifact | |
| mobject | package | sourcecode package MObject Subsystem including the Session (EDL), Builder and Processing Controller |
| MObject | package | |
| MObject | class | |
| Mutex | class | I provided a reworked Mutex class in my cinelerra2 repository |