Use your Android phone as a microphone for your PC

An FPGA-based USB 1.1 (full-speed) device core to implement USB-serial, USB-camera, USB-audio, USB-hid, etc. It requires only 3 FPGA common IOs rather than additional chips. 基于FPGA的USB 1.1 (full-speed) device端控制器，可实现USB串口、USB摄像头、USB音频、U盘、USB键盘等设备，只需要3个FPGA普通IO，而不需要额外的接口芯片。

Serial Port Programming in C++

Panic Playdate reverse-engineering notes/tools - covers file formats, server API and USB commands

DMA-accelerated multi-UART USB CDC for STM32F072 microcontroller

Samsung modem commands over USB serial connection and secret dialer codes extracted from system packages

USB serial device (CDC-ACM)

Arduino LANC to USB with GUI

Android Telephony, RIL, Radio of Modem module

A serial port class, for interfacing between Macs and microcontrollers. Works over USB serial.

The most complete Python library to interface with MCP2221(A).

A notifier that forward your sms from chip sim800c.

Allows USB printing to Panasonic KX-R/RK-T/RK-H typewriters, KX-W word processors, and KX-W55 printer. Emulates KX-R60 (working) and RP-K100/RP-K105 (in development) interface adapters

Virtual Serial Port (via USB-IP) to TCP Socket

Talk to a USB serial device without OS drivers!

Tutorials and example code for SAMD21 and SAMD51 microcontrollers

USB-UART-BRIDGE & ESP programmer featuring tag-connect

Isolated USB to Serial/RS232/RS485 converter with ESD protected input/outputs.

VEDirect data reader via serial USB for MPPT devices

A USB Serial band decoder and PTT breakout for the Icom IC-905 and IC-705, maybe other models. Can configure as a simple headless low power compact box, or add a touch display and optional encoders and switches for a remote control that supports transverter band display, control and band select.