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Hello Sofari
Here are some open-source QR code libraries and frameworks available that you could use to develop a custom solution. Here are a few examples:
- ZBar - an open-source software suite for reading barcodes from various sources, including image files and video streams. It supports many types of barcodes, including QR codes.
- ZXing - a popular open-source library for decoding and generating QR codes. It supports various programming languages, including Java, C++, and JavaScript.
- QR Code Scanner - an open-source Android app that allows you to scan QR codes and perform various actions based on the scanned data.
Remember that developing a custom check in/out system may require expertise in software development, security, and data privacy. It's important to follow best practices and ensure that any system you develop is secure and compliant with applicable laws and regulations.