Eyas 

Provides support for list equality and ordinal comparison based on the contents of its individual items. Allows users to pass ImmutableLists to dictionaries and hash sets, quickly copmare the values of individual ILists, etc.

Provides support polymorphic types in C#, such as Covariant and Invariant Maybe (Optional) types, and type unions.

Provides support for cached, memoized functions, that return the same value for repeated invocations with the same parameters. Inspired by C#'s System.Lazy class.

LINQ-like helpers and extension methods for IEnumerable. Type filters, Option-type conversions, flattening enumerables, fast single-element enumerables, and others.

Provides support for simple fluent logging that is lazily evaluated/printed when enabled.

A JavaScript fork of HtmlDiff, a library that allows diffing HTML files to output rich HTML text.

A TypeScript fork of HtmlDiff, a library that allows diffing HTML files to output rich HTML text.