X11 developer's 'workbench' and lightweight toolkit API
Free and Open Source GUI to Visualize Kubernetes Applications
Information Manager(split/analyze/compare/combine).
A .NET/Mono library for string-based user interface localization.
DocBook Editing and Processing for Eclipse
yEdGen can open a flow chart and generate ANSI C code from it.
Minimalistic properties editor for Qt applications
Plugin based multi-purpose dev tool.
Advanced multiplatform text editor for developers
A quick & dirty XUL / XBL prototyping editor for user interface.
A graphical editor for PlantUML diagrams.
A cross platform hex file editor
Graph editing tool
A visual editing environment for Sims3 JAZZ resources.
Python script coding editor that debugs as you write
Extensible binary and text editor.
Java classfile assembler/disassembler and interactive low-level editor