Zeal is a great app with documentation for developers! They already have portable version
https://zealdocs.org/download.html
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Zeal
February 19, 2017 - 10:51am
#1
Zeal
New: Audacious (June 1, 2023), Platform 25.0 (Apr 07, 2023)
New Apr 14: macOS Portable Drive Support
450+ real apps (49GB), 1.1 billion downloads, Please donate.
Zeal is a great app with documentation for developers! They already have portable version
https://zealdocs.org/download.html