To answer this question, let's go through each option to understand which one is not a TCS developed testing tool:
Option A) Sahi - This option is incorrect because Sahi is a testing tool developed by TCS.
Option B) SCEGEN - This option is correct because SCEGEN is not a TCS developed testing tool.
Option C) Testify - This option is incorrect because Testify is a testing tool developed by TCS.
Option D) Masketeer - This option is incorrect because Masketeer is a testing tool developed by TCS.
The correct answer is B) SCEGEN. SCEGEN is not a TCS developed testing tool.