Jeff,
The cource code of the standard llr can be found here:
http://jpenne.free.fr/index2.html
The latest version of llr is 3.7.1c for the standard client but for llrnet is llr3.5.0.
LLR test is way different from sieve and factoring so there's not yet a 64 bit version. The math is more complicated when we talk about the Lucas-Lehmer-Riesel test. Anyway, I don't think it will happen in a near future.
Carlos