Mastering Redmine is a comprehensive guide with tips, tricks and best practices, and an easy-to-learn structure.
Check the book project on this site and/or
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Among current marker images I like only the one for {NEW} marker... Will greatly appreciate any help in improving the look & feel of the markers!
The WikiNG plugin support theming (read here how)! Please share the theme you made for it (using the "Theme" tracker).
As of 0.0.3 WikiNG comes with CSS classes especially designed to be used in the Wiki syntax. You can suggest CSS classes by submitting an issue (please use the "CSS Class" issue category).