Roman Lygin, former developer and project manager at Open CASCADE has written a number of insightful articles about the library. They can be found on his blog. This is a summary of all his articles about OCC (sorted by subject).
(TO BE COMPLETED…)
Handles
Open CASCADE Handles. Let's handle'em. Part 1
Open CASCADE Handles. Let's handle'em. Part 2
Open CASCADE Handles. Let's handle'em. Part 3
Topology & Geometry
Topology and Geometry in Open CASCADE. Part 1
Topology and Geometry in Open CASCADE. Part 2
Topology and Geometry in Open CASCADE. Part 3
Topology and Geometry in Open CASCADE. Part 4
Topology and Geometry in Open CASCADE. Part 5
Topology and Geometry in Open CASCADE. Part 6
Adaptors
Surface Modeling
Surface Modeling. Part 1
Surface Modeling. Part 2
Surface Modeling. Part 3
Surface Modeling. Part 4
Surface Modeling. Part 5
Surface Modeling. Part 6