1 Introduction  
2 Cluster Sample  
2.1 Radio-selected sub-sample  
2.2 X-ray-selected sub-sample  
3 Observations and Data Reduction  
3.1 Observations  
3.2 Initial processing  
4 MGCLS Data Products  
4.1 Basic products  
4.2 Enhanced products  
4.3 Primary use cases  
4.4 Data quality issues  
5 MGCLS Source Catalogues  
5.1 Source detection  
5.2 Compact source catalogue  
5.3 Extended sources  
6 MGCLS Diffuse Cluster Emission  
6.1 New insights into known sources  
6.2 New clusters with diffuse emission  
7 Illuminating Individual Radio Galaxies  
7.1 Lateral edge enhancement  
7.2 Exceptionally stable bent jets  
7.3 A 300 kpc ring around interacting spirals  
7.4 The interaction of ICM magnetic filaments and radio tails  
7.5 A tail with ribs and tethers  
7.6 Dying radio galaxies  
7.7 Bulk gas motions far outside clusters  
8 Star-forming Galaxies  
8.1 Nearby spirals with MeerKAT  
8.2 Population studies in Abell 209  
9 HI Science Highlights  
9.1 HI data processing  
9.2 HI science examples  
10 Summary and Conclusions