I use Jefit, the free version. Totally customizable, syncs from the phone to the web, reports, graphs, goals, etc.
The workout shows what weights/reps you did last time, creates a really detailed log that's been very helpful. I've used it for SSLP, a modified 4 day SSLP, old man Texas Method, now whatever the fuck I'm doing... kinda GSLP with some old man tweaks to it.