Welcome to pWare!
AIX Open Source software for IBM System p server (formerly pSeries and RS/6000) machines running AIX 5.3 and higher. My name is Bill Jojo and I work at Hudson Valley Community College where we use a significant amount of Open Source software to manage our environment.
There are other sites doing similar work, but they don't always stay up to date and some use extracting executables, some LPP and some use rpm. Not that any of those are necessarily bad, but I decided to comply with IBM's installp program instead. This means that all the packages here are managed through the same method as AIX.
Another reason was to tie applications to other packages for dependency management. Not all rpms or self-extracting executables I've worked with have this feature. You are often on your own to figure out what additional packages you need to get an application working. Sometimes too, the packages are compiled with static libraries making upgrades more difficult to manage.