- Use for: For implementing functions such as zooming in and out when viewing pictures
- License: Apache License 2.0
- Use for: RecyclerView for dynamic loading and animation
- License: Apache License 2.0
- Use for: Image Loader
- License: https://github.com/bumptech/glide/blob/master/LICENSE
- Use for: for selecting and shooting pictures
- License: Apache License 2.0
- Use for: Implement rounded image view
- License: Apache License 2.0
- Use for: Implement curve, user correct rate, solving speed statistics chart
- License: Apache License 2.0
- Use for: Open / Close FAB implementation
- License: Apache License 2.0
- Use for: Implement Material EditTextView
- License: Apache License 2.0 (included in README.md)
- Use for: Implement Sliding Intro Screen
- License: Apache License 2.0
- Use for: Helper classes to reduce the effort of coding
- License: Apache License 2.0