Many individuals and corporations contribute to the ongoing development of SME Server, which is made available freely under the GNU General Public License. This license requires the public release of any modifications to the server, and allows these to be used to improve later versions. | Many individuals and corporations contribute to the ongoing development of SME Server, which is made available freely under the GNU General Public License. This license requires the public release of any modifications to the server, and allows these to be used to improve later versions. |