Here are few projects and exchanges that presently have referral programs ongoing
1. Electronuem
Download the app and you will get your referral link
2. Luno exchange
Register on their website and you will be given your referral link, the more people register with your link the more free bitcoin you will earn
3. BW exchange
Bw exchange is conducting different type of airdrops on their exchange and they have referral program too
4. Swissborg
Just same as electronuem app
5. Pivot app
Read new and get paid,refer your friends and win pivot tokens