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Yes. GDChart is still beta.

V0.94b is a stable release.
Most every chart type are currently used in professional production environments.

V0.10.1 has added some new functionality/features.

V0.11.x has added some new functionality/features.
Though a dev release, it, too, is stable.

If able to use GCC 2.7.1 (or better), it has ported very cleanly to many platforms. (Win/NT, FreeBSD, and AIX have some minor, easily overcome, differences in values.h system include file - I may rework GDChart to no longer rely on it.)
Some have gotten it to work with other compilers (MS VC++, most notably) - see README for more information.

So, what's version 1.0 waiting on
  • V1.0 will likely have a new interface, which will have a GDChart instance, rather than all those globals. This will allow the header files to finally be cleaned up.
  • Legends are high on the TODO list.
    Beta?
  • Stackable 3D AREA charts (GDC_STACK_DEPTH is currently the only supported type)
  • values.h dependencies. DONE 0.11.x
  • Optionally selectable Y Axis max and min values. DONE
  • Arrays interface rather than the var args, for calling flexibility and compatibility with other interfaces. Available in v0.95b
  • Documentation? HTML Usage/Help page? The chart and pie options pages are great references.
  • config/make/install distribution