Texas Instruments MSP430-GCC

Mitto Systems has partnered with Texas Instruments to bring you MSP430-GCC, a free, open-source and fully supported GNU Toolchain for the MSP430 microcontroller family.
Downloads of MSP430-GCC for Windows, Linux and macOS platforms are available from the Texas Instruments webpage for the project. The toolchain is also available as source code, and is installed alongside other MSP430 Development Tools in the Code Composer Studio IDE.
Bug reports, feature requests and other feedback should be posted on the TI e2e forum, using part number MSP430-GCC-OPENSOURCE.