Here is a curated list of the most active/relevant projects on GitHub

MQTTnet.Extensions.MultiCloud

Create dotnet MQTT applications compatible with any MQTT Cloud provider, such as Azure IoT, AWS IoT Core, Hive MQ or Mosquitto. Based on dotnet/MQTTnet.

• https://github.com/iotmodels/MQTTnet.Extensions.MultiCloud

IoTUX-MQTT

A web client application -no service code required-, to connect to a MQTT broker using websockets, and provide a dynamic UI by parsing the model.

• IoT-UX
• https://github.com/iotmodels/iotux-mqtt

Azure IoT Hub Web Client

Based on the Paho MQTT JS client for web sockets, this web client allows to simulate an IoTHub device, sending telemetry, reading/writing properties, and respond to command requests.

It allows to connect using Shared Access Keys, and DPS.

• https://mqtt.rido.dev
• https://github.com/ridomin/iothub-webclient

MSIX Catalog

WPF application, distributed as a .NET Core 3.1 global tool, to inspect MSIX/APPX applications deployed in Windows 10/11

• https://www.nuget.org/packages/dotnet-msix-catalog
• https://github.com/ridomin/msix-catalog