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MakeCode supports many hardware platforms, this is the direct link of"MakeCode for Micro:bit"
https://makecode.microbit.org/
MakeCode is a programming tool to create software for Micro:bit and a few more hardware boards.
There are some other similar tools for Micro:bit programming, but this is the most popular and most reliable, and it's free of charge, it's a product by Microsoft.
MakeCode is a web browser based light weight tool, you only need
Internet access
Normal web browser
FREE!