There are also several blog post on different UI-O-Matic subjects, we'll try to keep this list up to date.
​UI-O-Matic V2 and custom repositories​
​Extending UI-O-Matic V2 With custom List View filters​
​Extending UI-O-Matic v2 with custom List Actions
​Using UI-O-Matic V2 as an entries viewer for your custom forms