• Then

https://github.com/devxoul/Then

Copyright (c) 2015 Suyeol Jeon (xoul.kr)

The MIT License (MIT)

• SnapKit

https://github.com/SnapKit/SnapKit

Copyright (c) 2011-Present SnapKit Team

The MIT License (MIT)

• Firebase

https://firebase.google.com/docs/ios/setup

Copyright (c) 2015 Google, Inc.

Apache License 2.0

• kakao-ios-sdk

https://github.com/kakao/kakao-ios-sdk

Copyright (c)

Apache License 2.0