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A Simple cross-platform library for communicating with HID devices
HIDAPI is a multi-platform library that allows an application to interface with USB and Bluetooth HID-Class devices on Windows, Linux, FreeBSD, and macOS. HIDAPI can be either built as a shared library (.so, .dll or .dylib) or can be embedded directly into a target application by adding a single source file (per platform) and a single header.
RedComm is a Java library simplifying communication with a serial port
...RxTx is licensed under the LGPL 2.1 (http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html). RedComm also provides facilities for event based serial communication with the help of threading in order to non-block ie. the gui thread of the corresponding application.
RedComm is ideally suited for education e.g at schools.