We've just pushed out an update to the WebLogic Server 12.1.3 Developer Zip distribution containing the bug fixes from a recent PSU (patch set update).
This is great for developers since it maintains the high quality of the developer zip distribution and the convenience it provides - avoids reverting to the generic installer to then enable the application of patch set updates. For development use only.
Download it from OTN:
Check out the readme for the list of bug fixes: