andmartinelli 

Provides an almost drop-in replacement for String, with allocation-free substring/split methods, along with a ToStringCached() extension method that can be used on StringBuilders, ValueStrings and so on.

Additional System.Drawing APIs for netstandard .NET Standard

Low-allocation version of DiffMatchPatch

Excel spreadsheet (xlsx) manipulation library

Creates fast, strongly typed delegates for accessing methods, fields and properties. The right overload is automatically chosen based on the type arguments of Func<> or Action<>.

SevenZipSharp for netstandard and a few bug fixes.

An optimized version of HtmlAgilityPack with many bug fixes and improvements. Improved features: * Minimizes heap allocations and avoids duplicate strings in the heap * HtmlAttribute, HtmlAttributeCollection, HtmlNodeCollection are now structs * Proper encoding/unencoding of attributes * Fixed... More information

Provides an almost drop-in replacement for System.IO.File, optimized for a very large number of small files. Data is batched in package files, and can be read sequentially.

HTTP and HTML processing library

Low-allocation version of Snowball stemmers.

Shaman.Configuration.Metadata

Utils for efficiently reading from streams of UTF8 text. Commonly used types: Utf8StreamReader, Utf8StreamWriter, CsvReader, SqlDumpReader, Utf8StringCache, Utf8StringExtensions, Utf8Utils, MemoryBuffer, Scratchpad.

JSON/Protobuf serialization utilities, and console/CSV output support

Misc extension methods: CaptureBetween, CaptureAfter, CaptureBefore, RecursiveEnumeration, In.

Npgsql is a .NET data provider for PostgreSQL, 100% implemented in C# code. PostgreSQL 9.x and above is officially supported, other versions may work.

Shaman.DbLinq

Shaman.Fizzler

Provides wrappers for executing external processes, capturing their stdout, and automatically checking their exit code.

Strong named, netstandard-compatible version of CurlSharp.

Filesystem-related utilities