[`CommunityToolkit.Common`](https://learn.microsoft.com/dotnet/api/?term=communitytoolkit.common) | [](https://nuget.org/packages/CommunityToolkit.Common/) | [](https://nuget.org/packages/CommunityToolkit.Common/absoluteLatest) | A set of helper APIs shared with other [`CommunityToolkit`](https://learn.microsoft.com/windows/communitytoolkit) libraries.
[`CommunityToolkit.Diagnostics`](https://learn.microsoft.com/windows/communitytoolkit/diagnostics/introduction) | [](https://nuget.org/packages/CommunityToolkit.Diagnostics/) | [](https://nuget.org/packages/CommunityToolkit.Diagnostics/absoluteLatest) | A set of helper APIs (specifically, [`Guard`](https://learn.microsoft.com/windows/communitytoolkit/developer-tools/guard) and [`ThrowHelper`](https://learn.microsoft.com/windows/communitytoolkit/developer-tools/throwhelper)) that can be used for cleaner, more efficient and less error-prone argument validation and error checking.
[`CommunityToolkit.HighPerformance`](https://learn.microsoft.com/windows/communitytoolkit/high-performance/introduction) | [](https://nuget.org/packages/CommunityToolkit.HighPerformance/) | [](https://nuget.org/packages/CommunityToolkit.HighPerformance/absoluteLatest) | A collection of helpers for working in high-performance scenarios. It includes APIs such as [pooled buffer helpers](https://learn.microsoft.com/windows/communitytoolkit/high-performance/memoryowner), a fast [string pool](https://learn.microsoft.com/windows/communitytoolkit/high-performance/stringpool) type, a 2D variant of `Memory<T>` and `Span<T>` ([`Memory2D<T>`](https://learn.microsoft.com/windows/communitytoolkit/high-performance/memory2d) and [`Span2D<T>`](https://learn.microsoft.com/windows/communitytoolkit/high-performance/span2d)) also supporting discontiguous regions, helpers for bit shift operations (such as [`BitHelper`](https://learn.microsoft.com/windows/communitytoolkit/high-performance/span2d), also used in [Paint.NET](https://getpaint.net)), and more.
[`CommunityToolkit.Common`](https://learn.microsoft.com/dotnet/api/communitytoolkit.common) | [](https://nuget.org/packages/CommunityToolkit.Common/) | [](https://nuget.org/packages/CommunityToolkit.Common/absoluteLatest) | A set of helper APIs shared with other [`CommunityToolkit`](https://learn.microsoft.com/dotnet/communitytoolkit/) libraries.
[`CommunityToolkit.Diagnostics`](https://learn.microsoft.com/dotnet/communitytoolkit/diagnostics/introduction) | [](https://nuget.org/packages/CommunityToolkit.Diagnostics/) | [](https://nuget.org/packages/CommunityToolkit.Diagnostics/absoluteLatest) | A set of helper APIs (specifically, [`Guard`](https://learn.microsoft.com/dotnet/communitytoolkit/diagnostics/guard) and [`ThrowHelper`](https://learn.microsoft.com/dotnet/communitytoolkit/diagnostics/throwhelper)) that can be used for cleaner, more efficient and less error-prone argument validation and error checking.
[`CommunityToolkit.HighPerformance`](https://learn.microsoft.com/dotnet/communitytoolkit/high-performance/introduction) | [](https://nuget.org/packages/CommunityToolkit.HighPerformance/) | [](https://nuget.org/packages/CommunityToolkit.HighPerformance/absoluteLatest) | A collection of helpers for working in high-performance scenarios. It includes APIs such as [pooled buffer helpers](https://learn.microsoft.com/dotnet/communitytoolkit/high-performance/memoryowner), a fast [string pool](https://learn.microsoft.com/dotnet/communitytoolkit/high-performance/stringpool) type, a 2D variant of `Memory<T>` and `Span<T>` ([`Memory2D<T>`](https://learn.microsoft.com/dotnet/communitytoolkit/high-performance/memory2d) and [`Span2D<T>`](https://learn.microsoft.com/dotnet/communitytoolkit/high-performance/span2d)) also supporting discontiguous regions, helpers for bit shift operations (such as [`BitHelper`](https://learn.microsoft.com/dotnet/communitytoolkit/high-performance/span2d), also used in [Paint.NET](https://getpaint.net)), and more.
[`CommunityToolkit.Mvvm` (aka MVVM Toolkit)](https://aka.ms/mvvmtoolkit/docs) | [](https://nuget.org/packages/CommunityToolkit.Mvvm/) | [](https://nuget.org/packages/CommunityToolkit.Mvvm/absoluteLatest) | A fast, modular, platform-agnostic MVVM library, which is the official successor of `MvvmLight`. It's used extensively in the Microsoft Store and other first party apps. [The sample app repository is here](https://aka.ms/mvvmtoolkit/samples).
