The friendly Operating System for the Internet of Things
Here is a list of all modules:
[detail level 123456]
 BoardsBoard specific definitions and implementations
 CPUCPU specific implementations
 DriversDrivers for external devices as radios, sensors, memory etc
 File systemsFile system libraries
 KernelThe RIOT micro-kernel containing the core functionality
 Memory Technology DeviceLow level Memory Technology Device interface
 NetworkingNetworking libraries
 PackagesExternal libraries and applications
 SystemSystem library contains tools and utilities that make RIOT an actual operating system
 UtilitiesUtilities and helper functionality