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NSD graphical editor, for Java development and rev-engineering
HATE's an ASN.1 Text Editor.
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DocBook Editing and Processing for Eclipse
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Light-weight Scintilla-based text editor with syntax highlighting
A PlantUML editor written in Qt4
Pure Trait-based Programming on the Java Platform
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LEGO EV3 Utilities and Assembler
SQL front end for data administration and quick query hacks