Best open source PDF reader?

This page summarizes the projects mentioned and recommended in the original post on /r/opensource
PDF Files Luajit pdf-viewer Kobo

SurveyJS - Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App
With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
surveyjs.io
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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.
www.influxdata.com
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  • sumatrapdf

    SumatraPDF reader

    • I love Sumatra PDF but it's Windows only I think.

  • koreader

    An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Cervantes, Kindle, Kobo, PocketBook and Android devices

    • KOReader has an AppImage available, but if it's useful for you would depend on features you need/use. Best is super subjective.

  • SurveyJS

    Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.

    SurveyJS logo

  • PDF.js

    PDF Reader in JavaScript

    • Firefox uses PDF.js to render PDFs in the browser. I'm not sure it's on-par with dedicated PDF software, but it's pretty decent for what it is.

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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