Libraries to visualize hierarchical data as a tree (E.g.: file explorer)

Related to Key-Value storage

Tools to format the code (in the spirit of `fmt` for golang)

Tools to create applications with minimal hand-coding, for component-based software development, allowing users to drag and drop components to build applications

Libraries to format numbers and dates

Librairies to create beautiful HTML presentations... no more Powerpoint!

Libraries that help with manipulating String variables