New: DiskMon (Feb 02, 2023), Platform 24.0 (Jan 30, 2023)
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I am not sure which would suit best, but some kind of password manager would be really handy.
Been using KeePass for a while now, it works well, no trace left on the pc, just setup the DB in the same folder as the EXE. Might be a possible candidate for PortableApp-ness