For each layer in Blue Spatial you can optionally enable OData by clicking the edit button for the layer.
You can navigate to the OData endpoint by going to [YourDomain]/odata/layers.
OData layers in Blue Spatial are read only and return spatial types with each OData entity record. However we do not currently support the OData spatial query semantics but will soon.
There are lots of libraries for working OData and many connectors to enterprise software products. Here are a few: