Tools
Official Super Punch-Out!! Manual (hosted by Nintendo)

https://www.nintendo.co.jp/clvs/manuals/common/pdf/CLV-P-SAAXE.pdf (external link)

By Hootey

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Saves
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Splits
Excel: Full-game splits (Advanced, Macro-Enabled)

A macro-enabled spreadsheet for splits. Reset button, saves times for up to 5000 attempts, creates a page of run averages if you like data. Saves gold splits. (direct download)

By Hootey

Media:
Excel: Full-game splits (Basic)

Simple splits file. Manual deletion, will not track golds or attempts. (direct download)

By Hootey

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Patches
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