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: fb2kPortable / foobar2000 (Apr 18, 2024), Platform 29.4 (Apr 10, 2024)
1,000+ portable packages, 1.1 billion downloads
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Zeal is a great app with documentation for developers! They already have portable version
https://zealdocs.org/download.html