- https://doingclass.co.kr/offerpage
- https://class101.net
- https://hobby.conects.com/
- https://onoffmix.com/
- https://kmong.com/
- https://frip.co.kr/
- https://taling.me/
- http://mohana.kr/
- https://host.goodchoice.kr/
- https://event-us.kr/
- https://www.classbowl.com/
- https://www.otwojob.com/main
- https://ilii.kr/
- https://pren.kr/
- https://prompie.com/
- http://www.kipping.co.kr/
- https://www.dug-up.com/
- https://www.picple.tv/
- https://www.mybiskit.com/
- https://studypie.co/ko
- http://www.umclass.com/
- https://www.classtok.net/
- https://onenightclass.co.kr/
