devel usually refers to development versions of a library. It will include symbol-information, debugging traps and other things which make it easier to debug the library.
static versions of a library are ones that have been statically linked. Normally, when one library or program refers to another, it will use "dynamic linking," which causes the requisite libraries to be automatically loaded at the time that the program is launched. Static-linking, on the other hand, does not do this. The code from the other, requisite library is brought in when the library is built, so that there are no dependencies.