Integrated Development Environments / RAD tools / GUI-builders on Linux

• General/Editors:
  1. Amy (HTML, C, C++, Java, SQL, LaTeX, Makefiles and many more languages)
  2. blIDE (incomplete; no downloads as of yet)
  3. IBM's Eclipse (an extensible IDE kit; Java, C/C++, plus other languages via plug-ins that are becoming increasingly available, such as Perl via the EPIC plug-in)
  4. Code Crusader (supports just about everything) with the Code Medic debugger
  5. Glimmer
  6. InfoDock
  7. SGI's Jessie (doesn't seem to exist any more)
  8. Emediat Solutions's RadBuilder
  9. RHIDE
  10. CYGNUS's Source Navigator with the Insight debugger
  11. SciTE
  12. Titano
  13. WideStudio
  14. wxStudio
• Ada:
  1. GNAT Programming System (GPS)
  2. TIA (for GNAT Ada 95)
• BASIC:
  1. TrueBASIC (Linux version to be released soon)
• C/C++:
  1. Amy
  2. Anjuta
  3. ICS's BX Pro (for Motif/C++)
  4. Code Forge's C-Forge
  5. Code Blue
  6. Metrowerks's Code Warrior
  7. Bloodshed Software's Dev-C++ (for C/C++)
  8. DiaSCE
  9. IBM's Eclipse (an extensible IDE kit; Java, C/C++ in late beta, other plug-ins pending)
  10. gIDE
  11. Glade
  12. GNAT Programming System (GPS)
  13. CYGNUS's GNUPro
  14. FLTK & Fluid (for C++)
  15. IDEntify
  16. KDbg
  17. KDevelop
  18. KDE Studio
  19. Suite 3220 Software's Moonshine and Moonshine Professional
  20. OpenAmulet
  21. RHIDE
  22. QtEZ (for C++ w/Qt)
  23. Scintilla (for GTK+/C++)
  24. Wind River Systems / TakeFive Software's SNiFF+ and SNiFF Penguin
  25. CYGNUS's Source Navigator
  26. with the Insight debugger
  27. TogetherSoft's Together
  28. VisKProg
  29. MicroEdge's Visual SlickEdit
  30. Q Software Solutions's Wedit
  31. VDKBuilder
  32. VIDE (for C++ and Java)
  33. WideStudio
  34. wxBuilder
  35. wxDesigner
  36. wxStudio (for C++ and Python)
  37. Xwpe-alpha
• Objective-C:
  1. GNUStep's ProjectCenter
• ECMAScript (formerly "Javascript"):
  1. TrollTech AS's Qt Scripter (for the Qt Script extension of ECMAScript)
  2. Nombas, Inc.'s ScriptEase (for ECMAScript)
• Eiffel:
  1. Interactive Software Engineering's EiffelBench
• HTML:
• Java:
  1. Amy
  2. AnyJ (for Java)
  3. VioSoft Arriba
  4. BlueJ
  5. Chicory
  6. Omnicore Software's CodeG
  7. IBM's Eclipse (an extensible IDE kit; Java, C/C++ in late beta, other plug-ins pending)
  8. Elixir (for Java, HTML, Scheme, TCL)
  9. FreeBuilder
  10. Ginipad
  11. IntelliJ's IDEA
  12. Jasmine
  13. Borland's JBuilder aka JavaBuilder
  14. JCreator LE or Pro
  15. BulletProof's JDesignerPro
  16. Jedi
  17. Jedit (for Java, when used with plug-ins)
  18. Jipe
  19. JJTop
  20. JOODA
  21. Allaire's Kawa
  22. ProSyst's mBedded Builder (for embedded Java)
  23. NetBeans Developer
  24. Data Representations's Simplicity and Simplicity Professional
  25. Wind River Systems / TakeFive Software's SNiFF+ and SNiFF Penguin
  26. CYGNUS's Source Navigator with the Insight debugger
  27. Sun One Studio 4 (formerly Forte)
  28. SwingSoft's SwingBuilder
  29. TogetherSoft's Together
  30. VIDE (for C++ and Java)
  31. IST's Visaj
  32. Compuware's OptimalJ
  33. IBM's VisualAge Java
  34. Visual Paradigm
  35. IBM's WebSphere Application Developer (for Java J2EE)
• Pascal:
  1. Alice Pascal
  2. Borland's "Kylix Open Edition" (for GPL-licensed projects only, using Object Pascal aka Delphi or C++ source code, with Java to be added later)
  3. Lazarus (for Object Pascal/Delphi)
  4. fpGUI (for Object Pascal/Delphi)
  5. RHIDE
• Perl:
  1. ActiveState's Komodo
  2. PerlComposer
  3. WideStudio
  4. wxPerl
• PHP:
  1. ActiveState's Komodo
  2. Nexidion Designer
  3. Xored Web Studio (works as an Eclipse plug-in)
  4. Zend IDE
  5. Maguma Workbench (proprietary)
  6. Bluefish (primarily an HTML editor)
  7. Quanta+ (primarily an HTML editor
  8. Screem (PHP, XML; primarily an HTML editor / site-development environment)
• Python:
  1. ActiveState's ActivePython
  2. BlackAdder (for Python and Ruby)
  3. Boa-Constructor
  4. Cooledit
  5. Guido van Rossum's IDLE
  6. Jext
  7. ActiveState's Komodo
  8. PythonWare's PythonWorks Pro
  9. SPE (Stani's Python Editor)
  10. ViPEr
  11. ViPYL
  12. WideStudio
  13. Archeopteryx Software's Wing IDE
  14. wxPython
  15. wxStudio (for C++ and Python)
  16. Digital Creations's Zope Studio
• QT:
  1. QtEZ (for C++ w/Qt)
  2. TrollTech AS's Qt Scripter (for the Qt Script extension of ECMAScript)
• Ruby:
  1. BlackAdder (for Python and Ruby)
  2. WideStudio
• Scheme/Lisp:
  1. Elixir (for Java, HTML, Scheme, TCL)
  2. Jabberwocky (for Lisp)
• Smalltalk:
  1. Squeak (Smalltalk-80)
  2. VisualAge Smalltalk
  3. Cincom's VisualWorks Smalltalk
• SQL:
  1. Amy
• TCL/Tk:
  1. Elixir (for Java, HTML, Scheme, TCL)
  2. ActiveState's Komodo
  3. Quick-Tk
  4. Tcl Developer Studio (for Tcl/Tix)
  5. Visual Tcl
• wx (cross-platform/cross-language GUI library):
  1. Boa-Constructor
  2. wxBuilder
  3. wxDesigner
  4. wxPerl
  5. wxPython
• Other:
  1. EXOR International Inc.'s eVGS Development Suite (not ported yet)
  2. MetaCard Corp.'s MetaCard (for MetaTalk)
  3. National Instruments's LabView
  4. Omnis Studio (for the Omnis 4GL)
  5. Runtime Revolution Ltd.'s Revolution (for Transcript)

Warning: Some of the above are binary-only and x86-Linux-only.

http://linuxmafia.com/faq/Devtools/ides.html