Here is a list of all documented namespaces with brief descriptions:

Tes::Buffers
Tes::Collections
Tes::CoreTests
Tes::Handlers
Tes::Handlers::Shape2D
Tes::Handlers::Shape3D
Tes::IO
Tes::Logging
Tes::Main
Tes::Maths
Tes::Net
Tes::Runtime
Tes::Server
Tes::Shapes
Tes::Tessellate
Tes::TestSupport
Tes::Threading
Tes::Util