You should add "ebook reader without conversion". I use an iliad in landscape continuous mode with zooming and sometimes the multiple column mode (mostly for proceedings in US formats).
The main problem is speed for some of them. I still do not exactly understand why some work well and others are so slow (may be pdf from latex files with embedded latex fonts and not postscript ones).
I would like to have the time to look at popler and see if it can be further optimized for ARM processors (the level of optimization for x86 is probably close to optimal).
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