AIX
- The old AIX Public Domain Software Library at UCLA is now gone, but I found a mirror of it here. This is as easy as it gets. The site is laid out in a logical hierarchy. Find the package you want, drill down and get the tar file for your architecture and AIX Version. All you have to do to get the binaries is extract the file with zcat filename.tar.Z | tar xvf -
- Bull freeware offers packages that you can (and should) install through AIX's own package manager. They outline the installation process nicely on their site.
- IBM Has their own, as well. The AIX Toolbox for Linux, which essentially gives you RedHat's RPM package manager for which to install a plethora of IBM-packaged freeware.
Solaris
- Sun Freeware, much like Bull, provides actual Solaris packages, not just binary executables. You have to install stuff that you download from them, but they document it well.
- Sun Microsystems offers a lot of Freeware with Solaris, but you have to install it from the companion CD. This is available for download as well. Alternatively, you can just download the individual packages you want. Note, you need an account to download stuff from Sun. Creating an account is free. So is borrowing an existing account. ;)