Okular

简介

Okular 是一款功能丰富、轻巧快速的跨平台文档阅读器。您可以使用它来阅读 PDF 文档、漫画电子书、Epub 电子书，浏览图像，显示标记语言文档等。

macOS - Skim

简介

Skim is a PDF reader and note-taker for OS X. It is designed to help you read and annotate scientific papers in PDF, but is also great for viewing any PDF file.