The list of alternatives was updated Aug 2017.
#Fireshot chrome os x gives blank pdf update
You may want to check out more software, such as DocScan Pro, Citeknet CHM IFilter or yRead2, which might be related to Annotate!Pro Annotate!Pro (sometimes referred to as Annotate Pro, AnnotatePro) was added by Luis in Nov 2009 and the latest update was made in Jan 2020.