Both xtb and tblite are available under the GNU Lesser General Public License version 3.0 (LGPL-3.0) or later revisions of the license. This choice is made to ensure the package will be available as open source and also be included with proprietary projects. However, the LGPL-3.0 ensures that changes made to the project remain available to the community. Notably, most reimplementations of the xTB methods were done or started before the open source release of the xtb package, including the ones available in AMS, 55 CP2K, 56 entos, and Ter-aChem. Besides the implementations in xtb and tblite the xTB methods are available in many other software packages. In the AMS package, the GFN1-xTB method is provided as part of the DFTB module with an MPI parallel implementation. The implementation of GFN1-xTB in CP2K is provided both with MPI and GPU support and has been scaled up for molecular dynamics simulations up to 80 million atoms. TeraChem has an implementation of GFN1-xTB and GFN2-xTB (version with D3 dispersion) via a semiempirical integral library (SQMBox), which enabled excited state calculations based on the xTB Hamiltonians.