org.eclipse.ui.editors.text.TextFileDocumentProvider   

    org.eclipse.cdt.make.internal.ui.editor.MakefileDocumentProvider

    org.eclipse.cdt.internal.ui.editor.CDocumentProvider

    org.eclipse.jdt.internal.ui.propertiesfileeditor.PropertiesFileDocumentProvider

    org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider

    org.eclipse.dltk.internal.ui.editor.SourceModuleDocumentProvider

    org.eclipse.jdt.internal.debug.ui.snippeteditor.SnippetFileDocumentProvider

    org.eclipse.ant.internal.ui.editor.text.AntEditorDocumentProvider

    org.eclipse.cdt.internal.ui.editor.ExternalSearchDocumentProvider

Projects.
AJDT
BIRT
Buckminster
CDT
DTP
DSDP.DD
DSDP.TM
DLTK
Eclipse Monkey
ECF
Eclipse Platform
EMF
MQ, MT, VF
GEF
GMF
MDT
Model to Text (M2T) - JET
Mylyn
SOA Tools Platform (STP)
TPTP
Web Tools Platform (WTP)