Searching for a standalone JSP compiler

I wish this help you C#
http://www.mono-project.com/CSharp_Compiler

This might help you I recommend STL's MinGW distro, which is xcopyable and includes the latest GCC (currently, GCC 4.7).

I wish did fix the issue. I've been trying to incorporate the lessc compiler in a large project that has the basic setup from Bootstrap and it only results in various compileerrors (for which there are tickets for everyone with different solutions). , Here is how to use node and less to output to a file:

node path/to/less/bin/lessc -x -O2 path/to/assets/main.less > path/to/output.css

I hope this helps you . If, as you say, the end product is expected to be a fully functional software package, you can always include whatever external dependencies you need directly in that product - like a package.
This is actually a standard for OS X and apps downloaded from App Store (mainly) - each downloaded app contains its own binary, but it may contain other required binaries as well. Games are also frequently architected this way (the obvious deviations being DirectX and .net runtimes which need to be installed directly into the system).