G-Labs 

Serial Port libray for .Net / Mono Features - Easy to use - Event driven - Hot plug - Automatically restabilish connection on error/disconnect - It overcomes the lack of *DataReceived* event in Mono

Z-Wave Home Automation library (.NET / Mono) Features - Works with most Z-Wave serial controllers - 100% managed code implementation - Event driven - Hot plug - Automatically restabilish connection on error/disconnect - Compatible with Mono [Source Code and Home... More information

X10 Home Automation library for .Net / Mono Features - Supports both *CM11* and *CM15* hardware - Event driven - Hot plug - Automatically restabilish connection on error/disconnect - Compatible with Mono

MIG is a .Net library providing an integrated solution for developing multi-protocol networked applications and real time web applications.

W800RF32 RF Receiver library for X10 Home Automation (.NET / Mono) Features - Decoding of both standard and security X10 messages - Event driven - Hot plug - Automatically restabilish connection on error/disconnect - Compatible with Mono

Interface for MIG service that adds HomeAutomation commands for controlling X10 and Z-Wave devices.

X10 CM19 Transceiver library for Home Automation Features - Supports sending and receiving of following X10 RF messages: - Standard module commands (On, Off, Dim, Bright, AllLightsOn, AllUnitsOff) - Camera pan/tilt commands (Left, Right, Up, Down) - Security sensors (Motion and... More information

Interface for MIG service that adds commands for controlling UPnP devices. https://genielabs.github.io/HomeGenie/api/mig/mig_api_upnp.html