JE-Comics is a Java application able to convert a group of images into a pdf.
It can take as an input Jpeg, gif and png files even if compressed in a zip or cbz file.
Useful for making an e-book friendly version of comics, or just easily convert the scan of documents and notes into pdf.
It has builtin support for some ebook readers (like Iliad and sony prs), and some image optimization filters for enhancing the quality of the resulting pdf.
This software is released as freeware but i do plan to release it as open source in the future.