The best replacement for source code is object code.

The best alternatives to source code are rated as following:
★★★★★  object code
★★★  machine code
★★  compiled code
★★  bytecode
★★  binary
★★  executable code
★★  closed source code
★  executable
★  binaries
★  binary code
★  limitless
★  deja vu
★  inception
★  looper
  referral code
  proprietary software

Your alternative for source code is not listed? Suggest!
Speaking about source code, one probably shouldn't forget about project.

Other search terms related to source code and their ratings are:
★★★★★ project
★★★★ license
★★ matlab
You have in mind a companion for source code and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of source code in all years. Click on graph for more.
source code
object code
machine code