The best free alternative to Orion Viewer is Foxit PDF Reader. It's not free, so if you're looking for a free alternative, you could try Foxit PDF Reader or MuPDF. If that doesn't suit you, our users have ranked more than 25 alternatives to Orion Viewer and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Orion Viewer are Adobe Acrobat Reader, MJ PDF Reader, Secure PDF Viewer and WinDjView.
Foxit Reader offers a lightweight PDF viewing experience across multiple platforms with features such as annotation, form filling, signing, cloud storage integration, collaborative review options, heightened security via Trust Manager, and organizational tools like Group Policy and XML Configuration.
MuPDF offers a highly versatile PDF, XPS, and eBook interpreter, customizable as a renderer, viewer, or toolkit. Features include digital signatures, redactions, form filling, annotations, and page manipulation, ideal for mobile, eBooks, and embedded apps supporting Java, C++, and Python.
An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Kindle, Kobo, PocketBook, Linux and Android devices.
Seamlessly view, annotate, and collaborate on PDFs with freehand drawing and sticky notes. Utilize cloud storage for effortless access and upgrade for advanced editing and conversion to formats like Word and Excel.
Simple Android PDF viewer based on pdf.js and content providers. The app doesn't require any permissions.
WinDjView is a fast, compact and powerful DjVu viewer for Windows with tabbed interface, continuous scrolling and advanced printing options. It uses the free DjVuLibre library to decode DjVu documents. DjVu is a web-centric format and software platform for distributing documents...
Document Viewer is a highly customizable document viewer for Android, fork of the last GPL version of EBookDroid .
Comprehensive solution for editing, signing, form filling, OCR scanning, commenting, converting, and redacting PDFs, with AI-driven analysis and content extraction, data export to spreadsheets, text-to-speech, seamless use across desktop and mobile, and batch processing.
EBookDroid is an open source (GPL'ed) document viewer for Android based on the VuDroid code base.
The simplest PDF viewer. Safe (doesn't require permissions), lightweight (just 6,9MB) and modern.
Comic Book Reader is the viewer you need to enjoy all your electronic publication. It is available both as Desktop and Windows 8 Metro UI for PC and tablets.
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