MinGW GCC cross development environment for ARM.
Modern experience for GDB with advanced debugging capabilities
The Open On-Chip Debugger
Debugging and programming interfaces for Freescale microcontroller
CI maintained precompiled GCC ARM/ARM64 Toolchains for Raspberry Pi
Cross-platform IDE for developing embedded solutions and desktops
Embedded linux and cross toolchain
a very fast full system simulator
An in-application debug probe for ARM Cortex-M microcontrollers.