@sarahwilliams25 I will be the judge of what is the "better" app,as I'm sure others are also capable of making the same choice for themselves thank you :)
MIKLO

Jan'sFolderSize v1.31 : Oldie but Goodie product !

Belatedly noted JFS scores 9/60 on Vir*sTotal, mildly concerning results most probably imputable
to JFS *.exe being packed with ASPack compressor, which many vir*s checkers tend to frown upon.

No matter, JFS has been running forever with aplomb and without any apparent side effect on my overly oldie XP machine...;-)

A better natively portable app can be found here:
http://www.portablefreeware.com/index.php?id=1725

@Nocseiz

I hope someone from TPFC is keeping track of some of the suggestions listed, this app has not been developed for ages, as far as I can tell the site has been abandoned due to the dev's passing in 2002, the site maybe 2006.

The site's forum link forwards to 'lulu's love shack' so I quickly closed the page.

Maybe TPFC could host a safe copy, if only to pay homage to Jan Horn.

Certainly one of my favorite disk usage programs, but recently found that it won't let you click on a given file structure and open that in Explorer. Most other viewers have this option and its seems like a bit gap.

Database files, Exchange files, etc.

what possible file on earth could be bigger than 32 gb???

Yes, the version from the web site is v1.31, but be aware that this program does not handle files larger than 32GB. Had a directory containing 200GB of files, the largest being 37GB and this program reported that the directory contained only 11GB of files (and likewise the total size for the drive was wrong too). Would recommend this program instead: http://www.portablefreeware.com/?id=631

A great program that can match SpaceMonger (which writes to the registry, and available here).
Note that the version in the software is 1.3x instead of 1.4 as documented in the authors website.