Just my notes, not reliable interpretations.

GPL

Seems to me like version 2 can be used without problem in ASPs, as long as the code, binary and/or source, is not distributed. Word has it that version 3 will change that. So watch out!

There is also an interpretation about derivative works, and a program that is merely aggregated is not a derivative is not covered by the GPL.

LGPL

This is not problematic. You are able to incorporate LGPL code into another application and distribute that application without releasing the other application under the GPL.

BSD

Everyone seems to think this application is good.

Apache

No problem

PHP

No problem so far, if they change the license, you can always use an existing version.

Informed Licensing

For more information about open source licenses, check out Informed Licensing.