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Snappy
PHP library allowing thumbnail, snapshot or PDF generation from a url or a html page. Wrapper for wkhtmltopdf/wkhtmltoimage (by KnpLabs)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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gotenberg
A developer-friendly API for converting numerous document formats into PDF files, and more!
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
Snappy - https://github.com/KnpLabs/snappy/graphs/contributors
PHPPdf - https://github.com/psliwa/PHPPdf
WKHTMLToPDF - https://github.com/wkhtmltopdf/wkhtmltopdf
https://gotenberg.dev/ is what you want. Gotenburg provides an api to do all sorts of conversions. Word conversion is basically headless open office.
Pandoc a universal document converter, might be an alternative if you could run that like a "service"
The one I used a few times where a headless browser or another service was not an option was mPDF: https://github.com/mpdf/mpdf
There is also a PHP client to ease the interactions with the API: https://github.com/gotenberg/gotenberg-php