Read/write filesystem support for Android.
While it doesn't offer pure read/write access like you'd expect, this lets you mount things. You can use any other file manager (I use several most notably Total Commander and Ghost Commander), and it prompts to download the file.
Has a free version, but I don't know what the difference between that and the pay version is.
NTFS, exFAT, HFS+, FAT32, extFS
A ubiquitous byte-copying tool.
I use this for copying disks, partitions and ISOs.
A program, or Perl script, which does regular expression-enhanced batch renaming.
Software > Search >
"The GNU Find Utilities" is one of those packages that's installed everywhere.
find is one of those programs everyone ends up using and ends up being horrified at.
Software > Ruby > Files >
Apparently it requires sqlite - but gem is fucking insane and locks my system up trying to update.
nice -n gem install sqlite