sunamo 

Values shared across many packages

Library with templates for throwing exceptions

Enums shared across many packages

Shared library with data classes passed into methods as arguments

Shared delegates across many packages

Advanced working with colors

Shared packages across packages with instance data-holder classes

For working with extensions of files

Dictionary where every key is value and vice versa

Interfaces shared across many packages

Support for language, independent of translating solution

One of base foundation for sunamo's app platform - second is SunamoPlatformUwpInterop

Almost all extensions method which I'm using

Data for deriving in every SunamoString package

Generating string output in various formats

Methods for show Countdown and other UI in cmd

Advanced working with base .NET type (parsing etc.)

ReadAllText, WriteAllText etc. with some magic ability

Just fork from https://www.nuget.org/packages/fmdev.XliffParser, due to .NET 5+

Methods for splitting strings