Instant answers will be very helpful for most developers:
- Spring framework is one of the biggest
- Java EE standards for enterprise java
- Hibernate the most popular ORM
- Android is also java :)
There are different "awesome" lists of libraries and frameworks:
- https://github.com/akullpp/awesome-java
- http://java-lang.github.io/awesome-java/
- https://github.com/tedyoung/awesome-java8
- https://github.com/pditommaso/awesome-java
- https://github.com/uhub/awesome-java
- https://github.com/wasabeef/awesome-android-tools
- https://github.com/wasabeef/awesome-android-libraries
- https://github.com/JStumpp/awesome-android
- https://snowdream86.gitbooks.io/awesome-android/content/
Maybe duckduckgo could help developers to discover libraries.
Some websites with tutorials and discussions that could be used for code examples
- http://www.javais.cool/
- https://github.com/vbauer/java-blogs
- https://github.com/vbauer/android-blogs
Cheat sheets and reference cards
thanks!! https://forum.duckduckhack.com/t/java-search-brainstorming/748/5