GTK+

If you're a developer and are desperately looking for aid in creating a Graphical User Interface, otherwise known as a GUI for whatever project you have under development, GTK+ might come in handy. Of course, this isn't really child's play, so you'll have to be pretty knowledgeable in order to use this specific toolkit.

Indeed, it might offer some aid to developers, but it still requires you to understand how it works and what it does precisely. Being part of the GNU Project, this piece of software will always be free for use regardless of any scenario or situation. This is great news especially for those aiming to create software in order to sell it to other individuals. This particular toolkit combines four resource libraries in order for greater diversity to be achieved.

Whether you need GLib, Pango, ATK, or Cairo library components, you should find them when using GTK+, no problem. If one also adds the fact that this particular software can work with more than one coding language, then there is basically no reason not to give it a try if you're actually looking to use what it has to offer. C++, Python, and Perl are just some examples of languages that can be indeed used with GTK+.