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1. A collection of classes and functions to make the creation of descriptors simpler and quicker.

   Python 11 4

2. A strongly typed "dependency injection" system that doesn't primarily use strings as the "keys". Instead, it uses type-safe factory objects.

   Kotlin

3. A matcher library similar to Hamcrest, but with all data types being immutable.

   Java

4. A small library of helpful classes made possible and useful thanks to Java 8 functional programming.

   Java 4 2

5. Matcher library that prefers to do as much as possible immutably

   Python

6. Going through the steps of making your own DI "system" within an app, not requiring a true DI framework

   Java