
Arm Keil MDK
7.9#1 in embedded systems toolchainsFrom 82.39 CHF a monthFree planWebAPIExtensionLinux
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Keil MDK suits developers building embedded applications for Cortex-M or Ethos-U processors. Community is for non-commercial use, while the listed paid v6 plans cover commercial use.
Particle Web IDE suits developers working with Particle device platforms and writing C or C++ firmware. The free tier may suit work within its allowance; teams needing larger or tailored Data Operations packages can consider paid options.