With TuxGuitar, you will be able to compose music using the following features
Autoscroll while playing
Note duration management
Various effects (bend, slide, vibrato, hammer-on/pull-off)
Support for triplets (5,6,7,9,10,11,12)
Repeat open and close
Time signature management
Imports and exports gp3,gp4 and gp5 files
Development Environment, Tooling Platform and Application Framework.
Apache NetBeans is much more than a text editor. It highlights source code syntactically and semantically, lets you easily refactor code, with a range of handy and powerful tools. Apache NetBeans provides editors, wizards, and templates to help you create applications in Java, PHP and many other languages. Apache NetBeans can be installed on all operating systems that support Java, i.e, Windows, Linux, Mac OSX and BSD. Write Once, Run Anywhere, applies to NetBeans too....
A powerful, free design tool
Whether you are an illustrator, designer, web designer or just someone who needs to create some vector imagery, Inkscape is for you!
Flexible drawing tools
Broad file format compatibility
Powerful text tool
Bezier and spiro curves