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In page Bluefish (software):

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Users are able to use wizards to assist in task completion.[1] Syntax highlighting, auto-completion, code folding as well as auto-recovery, upload/download functionality and a unicode character browser are all included. A programming-code-aware in-line spell checker, and support for Multiple document and projects are catered for. Code navigation and bookmarks are supported. Multiple encoding and zencoding are supported. The program is extensible via plugins and scripts. The SASS style language has been added in the 2.2.8 release.