What are your favorite tools for Embedded Systems Development?

In this blog post, you'll learn about what are some of the EOC speakers' favorite tools for Embedded Systems development.
Are your favorite tools the same as the speakers? In this forum post, I would love to learn about YOUR favorite tools for Embedded Systems development.
Thanks!
#FAQ

Voting for the lowest hanging fruit: an O'scope! Can't have too many or too few channels - bandwidth is project dependent.

Multimeter and scope are primary tools.
Next level must include a logic analyzer.

To easily write unit tests in C: ceedling
A devOps tool (gitlab, Azure DevOps)

Here are some popular hardware and software tools for the development and debugging of Embedded Systems:
Hardware Tools:
- JTAG/SWD Debuggers
- Logic Analyzers
- Oscilloscopes
- Power Supplies
- Microcontroller/Microprocessor boards
Software Tools:
- Integrated Development Environments (IDEs) like Keil MDK, Eclipse CDT, IAR Embedded Workbench
- Debuggers like GDB, Insight
- Real-time Operating Systems (RTOS) like FreeRTOS, RTX
- Firmware libraries and middleware like Arm Mbed, ChibiOS/RT
- Emulators and simulators like QEMU, Proteus.
These tools can be used to develop, test, and debug embedded systems effectively.