HotSpot
HotSpot is a Java Virtual Machine developed by Sun Microsystems. It is the primary Java Virtual Machine for desktops and servers. HotSpot was originally developed by Longview Technologies, LLC in 1999. In 1997, Longview Technologies, LLC was purchased by Sun Microsystems.
HotSpot features techniques such as just-in-time compilation and adaptive optimization designed to improve performance. Hotspot provides a class loader, a bytecode interpreter, a Client and Server runtime compilers from bytecode to native instructions, several garbage collectors, and a set of supporting runtime libraries. Sun released the Java HotSpot virtual machine and compiler as free software under the GNU General Public License on 13 November 2006.