Step 1: About award. The Skoll Award is an international recognition for innovative organizations solving social challenges.
Step 2: Indian winners. In 2012, the award was given to NASVI and Nidan for empowering street vendors and supporting their rights and livelihoods.
Step 3: Eliminate wrong options.
- Sulabh International → famous for sanitation reforms, but not the 2012 Skoll Awardee.
- Sambhav, RSS, Zed Tech → not related.
Step 4: Conclude. Correct answer is NASVI and Nidan.
\[
\boxed{\text{NASVI and Nidan}}
\]