Prebuilt SD Image zip file
Terminal emulator, for example
Windows: teraterm (https://osdn.net/projects/ttssh2)
Linux: picocom (https://github.com/npat-efault/picocom/releases)
Windows: Win32 Disk Imager utility (https://sourceforge.net/projects/win32diskimager)
Windows: 7zip utility (https://sourceforge.net/projects/sevenzip/)