New: Wise Duplicate Finder (Jan 23, 2023), Platform 23.1 (Jan 11, 2023)
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I do know some applications which are portable and might work with portable apps
True Crypt www.truecrypt.org (An open source encyption Software)
The File Splitter http://www.dekabyte.com/filesplitter/ (File splitting application)
Free Download Manager www.freedownloadmanager.org (Download Manager)
I know that TrueCrypt and FDM have been mentioned before, with lengthy discussions. I'm also fairly sure that file splitters have been mentioned before too. So, please do search before posting.
7z does file splitting diring compression. i have used it many times to move files to floppy and it works great.
Do people still use those? 
...but yup, they do.
I even have an LS-120 SuperDrive & some discs for it, but I'm too lazy (and/or busy) to get under the hood and remember how to hook it up and configure it to get it working (my original one died ~2-3 yr ago, and I bought a cheap used one, but STILL haven't hooked it up!...)
What's an LS-120 SuperDrive? 5 1/4 floppy or tape or something else?
FDM ROCKS and DOWN THEM ALL ¼|!@3 !!!
I have one too! I got it from my first desktop replacement laptop, the Transmonde. Came built in with one. I loved it since it also took the LS-120 disks and the 3/5 floppies as well, so it saved space. I used it to back up and secure files, since like maybe 10 people in Los Angeles had them, and so no one else would be able to get files off of them. 
I know a guy that runs a business on one of the origional mac os's with zip drives.
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