Current version (1.2.0):
Layout manager library:
The swing-layout library can be download from here:
If you download the binary (compiled) version of LWTT you don't need this library. It is included inside the packages. This library is licensed under the GNU Lesser General Public License. All versions of this library are available on the web page of the project.
These packages contain everything you need for building from sources (on Linux): source files themselves, the layout manager library and a very simple Makefile. Download, unpack and type 'make' (and 'make clean' for later cleaning). That's all.
Older versions of LWTT can be found in the download archive.