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Browsershot is a PHP package that allows developers to convert web pages into images or PDFs. It utilizes headless Chrome to render pages accurately and can be used to capture screenshots, generate PDFs, and manipulate web content programmatically. It is especially useful for applications that require generating visual content from dynamic or static web pages.
Free OMR - OCR web sofware based on javascript and PHP
...Once you have parameterized your form, you can print many of them, give it to your students/respondents, scan and recognize them with formread, and you can finally export the data in your preferred formats (excel, pdf, csv)
phpScanTool is a web based front-end for Sane, it was originally developed to manage an HP OfficeJet printer/scanner/copier, it can easily manage front/back scanning, rotation, and PDF creation.