FLTK (pronounced "fulltick") is a cross-platform C++ GUI toolkit for UNIX/Linux (X11), Microsoft Windows, and Mac OS X. It provides modern GUI functionality without the bloat, and supports 3D graphics via OpenGL and its built-in GLUT emulation. FLTK is designed to be small and modular enough to be statically linked, and also works fine as a shared library. It also includes an excellent UI builder called FLUID that can be used to create applications in minutes.
System requirement is not defined
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
This release is a huge step in the FLTK 1 series. All strings in FLTK are now handled in UTF-8 format and support the full range of Unicode character sets everywhere. International input methods are supported on all platforms. Two new widgets were added: Fl_Tree and Fl_Table. Printing is now as easy as drawing into a window, and window printing of FLTK GUIs is supported, including OpenGL. Internally, FLTK has been upgraded to run on current Unices, Windows 7, and Mac OS X via Cocoa. All graphics calls now use device abstraction.
Improved color contrast in secondary selection blocks of Fl_Text_Display, a fix for a regression in callback handling, a fix for incorrect relative paths when the absolute path has a trailing slash in fl_filename_relative, a fix for multiple selection of files and directories in Fl_File_Chooser, and a fix for a crash under MS Windows when selecting umlauts in Fl_Help_View.
This release fixes many bugs, and improves OS X and Quartz compatibility and overall reliability. It has a new GTK+ style theme, better GLUT4 compatibility, and alpha blending for image maps. This is the final release of the 1.1.x development tree.
This release fixes many bugs, adds some new example programs, and adds many new improvements to the FLUID software, including multi-level undo, syntax highlighting in all code fields, widget alignment and sizing guides, dialog templates, widget subclasses, and printing and testing of user interfaces within FLUID.
This version adds a Fl::delete_widget() method to safely
delete widgets in callback methods. It fixes a problem where
Fl_Double_Window produced an error on resize with X11
FLUID didn't display menu items using images
properly, an issue where FLUID didn't handle default function
parameters properly, and a problem where FLTK windows
could appear off-screen on X11. The configure script now
supports --disable-localfoo to completely disable image file
support. The scandir() conditional code was fixed for HP-UX
11i. There were some Open Watcom fixes, and some fixes
for the library include order when building DSOs on MacOS
X. fl_xid() no longer causes Win32 applications to crash.