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QuestPDF
QuestPDF is a modern open-source .NET library for PDF document generation. Offering comprehensive layout engine powered by concise and discoverable C# Fluent API. Easily generate PDF reports, invoices, exports, etc.
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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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echarts
Apache ECharts is a powerful, interactive charting and data visualization library for browser
- Azure Function app on .NET 6.0, connected to SQL server using SSH.NET for an SSH tunnel and [MySQL's .NET connector](https://dev.mysql.com/doc/connector-net/en/)
For pdf, you may try https://github.com/QuestPDF/QuestPDF (Somebody from here posted in discuss your project). We are not sure if your stack is web-based on winform or web. For razor, anything can be done like PHP does and using free solution e.g
https://github.com/NobodyButMe-Haiya/rebel-northwind/blob/master/RebelCmsTemplate/Views/Home/Main.cshtml and can view the output in youtube.
ECharts -- open source js lib for enterprise-grade charts