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: r3dfox (July 15, 2025), Platform 30.0.4 (July 15, 2025)
1,400+ portable packages, 1.2 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