Source one have a Cost free, and Activitys some, and Editor markitup?
Editor Site Style, clone of Cost ( US$ ) Open source Activity
Comparison of JavaScript-based source code editors
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Overview
List of source code editors
Ace (editor) Home, demo Sublime Text / Microsoft Visual Studio Free Yes Yes
CodeMirror Home, demo plain textarea Free Yes Yes
Orion Home Eclipse SWT StyledText, regular textarea Free Yes Yes
Monaco Editor example Microsoft Visual Studio used only by Microsoft No Yes
Markitup Home, demo Markup editor, no syntax highlight Free Yes Some
LDT Home regular textarea Free Yes Some
Ymacs Home, demo Emacs Free Yes Some
CodePress Home Microsoft Visual Studio Free Yes No
CodeTextArea Home, demo Microsoft Visual Studio Free Yes No
EditArea Home, demo Microsoft Visual Studio Free Yes No
Helene Home [ dead link ] , demo [ dead link ] Microsoft Visual Studio Free Yes No
9ne Home Emacs Free Yes No
jsvi Home vi Free Yes No
MDK-Editor Home Microsoft Visual Studio Depends on use Code is readable No
SELECT Open source FROM table WHERE Cost ( US$ ) = free AND Activity = some AND Editor = markitup
free some markitup