yeah, this is the best solution of those posted in this thread. 7-Zip
It is open source, cross-platform and supports all the major formats (zip, rar, iso, gzip, etc.).
I feel like an old codger, since I still think of it as "new."
The .msi also has an amazing compression ratio if you want to use its native format.
Accept the past. Live for the present. Look forward to the future. Robot Fusion
"As our island of knowledge grows, so does the shore of our ignorance." John Wheeler
"[A] scientist looking at nonscientific problems is just as dumb as the next guy." Richard Feynman
"[P]etabytes of  data is not the same thing as understanding emergent mechanisms and structures." Jim Crutchfield