Resulting from a discussion over at the Graphic Design StackExchange site about if and how to justify text it is generally concluded that justification is preferred if the text is hyphenated in a proper way (to avoid whitespaces and rivers).
The related questions are
Justification and hyphenation without proper time and tools?
Readability and appeal of justified text
Does hyphenation increase legibility?
An answer to the first link suggests LaTeX but I wonder if there are other programs or tools (for example an extension for LibreOffice) to hyphenate text.
