I’ve been a very happy user of LiquidText [1]. You can load multiple PDFs/images/documents into a LiquidText project and annotate and cross reference. There’s a

I’ve been a very happy user of LiquidText [1]. You can load multiple PDFs/images/documents into a LiquidText project and annotate and cross reference. There’s a separate work space outside of the documents where you can store clippings and collect summaries. It’s great for reading long standard documents and cross reference between them and supporting material like examples etc. [1]: https://www.liquidtext.net/ https://www.liquidtext.net/