GTK Toolkit
from http://www.gtk.org
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Written in C
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Available on all UNIX platforms under the GNU GPL licence.
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Has bindings for several languages, among them C and C++
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Looks very sleek, Motif / Netscapeish feel.
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wxWindows 2.0 is using GTK for UNIX platforms
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No GUI Builder as of yet.
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Multithreaded (albeit needs some trickery and work)
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Some OpenGL support, but full OpenGL support in wxWindows 2.0 which
uses GTK under UNIX.
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Various 3rd party support under wxWindows, including socket/network
package, multi-threading package(with Motif only), OpenGL/Mesa
wrappers, and others.