Singulink 

Automatic null check injection for runtime C# Nullable Reference Types (NRT) parameter/contract validation.

Extensions and helpers for BigInteger, including a cache that stores powers of numbers so they don't have to be computed each time.

Fully-featured support for arbitrarily large precision decimal values.

Collection classes that store weak references to values so that they can be garbage collected when they are no longer needed.

Reliable cross-platform strongly-typed file/directory path manipulation and file system access.

Provides base types to support custom DHCP server implementations.

Library that facilitates file and image storage for hosting purposes.

Upgradable hash algorithm password management library for .NET.

Allows binding events directly to methods, including passing custom parameters.

The Silverlight 5 Toolkit MSTest testing support package. Contains all the assemblies required to do unit testing for your Silverlight project. Packaged by Singulink (www.singulink.com) as apparently no more... More information

The core Silverlight 5 Toolkit controls package. Includes the Internals assembly missing from Tim's semi-official SL4 package. Packaged by Singulink (www.singulink.com) as apparently no more love is being shown... More information

A simple yet versatile .NET tokenized string formatting library written in C# to replace string.Format.

Fast, efficient, low-memory footprint generic operations and extension methods for enumeration types.

Adds Argon2 hash algorithm support for Singulink.Cryptography.PasswordHasher.

The Silverlight 5 Toolkit input controls package. Packaged by Singulink (www.singulink.com) as apparently no more love is being shown by Microsoft for Silverlight :(

The Silverlight 5 Toolkit data visualization controls package. Packaged by Singulink (www.singulink.com) as apparently no more love is being shown by Microsoft for Silverlight :(

The Silverlight 5 Toolkit layout controls package. Packaged by Singulink (www.singulink.com) as apparently no more love is being shown by Microsoft for Silverlight :(

The Silverlight 5 Toolkit theming core package. You must add specific theme assemblies separately. Packaged by Singulink (www.singulink.com) as apparently no more love is being shown by Microsoft for... More information

The Silverlight 5 Toolkit DataForm controls package. Packaged by Singulink (www.singulink.com) as apparently no more love is being shown by Microsoft for Silverlight :(

Range types for each primitive integer type that can be enumerated over, intersected, unioned and coalesced.