Kharagpur Winter of Code, abbreviated KWoC is an annual month long Open Source contest held in December - January every year by the KOSS (Kharagpur Open Source Society). It is to introduce newbies to the world of Open source programming, and hosts projects from many organisations that the students can contribute to. It is non competitive (There is a leaderboard though). It serves as useful preparation for the Google Summer of Code, whose registration opens in March.
KWoC website: https://kwoc.kossiitkgp.org/
KOSS Facebook Page: https://www.facebook.com/kossiitkgp/
This page is the best way to get updates on the competition.
Slack discussion link: Create Account | Slack
You can use this to get immediate replies to any general queries you may have.
Please note that the coding period has started on 7th December. You need practice to get cracking at GSoC, so if that’s your end goal get cracking immediately. Even if it isn’t, its a safe way to dip your toes in the ocean of open source.