When comparing Kami PDF vs Jarnal (Java, cross-platform), the Slant community recommends Jarnal (Java, cross-platform) for most people. In the question“What is the best software to annotate a PDF?” Jarnal (Java, cross-platform) is ranked 4th while Kami PDF is ranked 6th. The most important reason people chose Jarnal (Java, cross-platform) is:
It is possible to connect multiple Jarnal clients to a single Jarnal server for collaboration on the same document. However, only one person can make changes at a time.
Specs
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Pros
Pro Collaborative PDF editing
Pro Includes OCR
Pro Collaboration over network (although limited)
It is possible to connect multiple Jarnal clients to a single Jarnal server for collaboration on the same document. However, only one person can make changes at a time.
Pro Free and open-source (GPL license)
Cons
Con Some actions are not intuitive
Opening a PDF into Jarnal is not intuitive. The only way I found is by using the supplied shell script. I could not find how to do it from within the UI.
Con Written in Java using Swing toolkit
As with most Java apps, the UI looks alien to all operating systems.