I have found that Sumatra is open source project [Git](https://github.com/sumatrapdfreader/sumatrapdf) and that there are some users with similar needs [1](https://github.com/sumatrapdfreader/sumatrapdf/issues/79), [2](http://forums.fofou.org/sumatrapdf/topic?id=3184694&comments=3), [3](http://forums.fofou.org/sumatrapdf/topic?id=3184675&comments=5).
I have found that Sumatra is open source project [Git](https://github.com/sumatrapdfreader/sumatrapdf) and that there are some users with similar needs [1](https://github.com/sumatrapdfreader/sumatrapdf/issues/79), [2](http://forums.fofou.org/sumatrapdf/topic?id=3184694&comments=3), [3](http://forums.fofou.org/sumatrapdf/topic?id=3184675&comments=5).