PPC PASCAL - A superb Pascal compiler. Many commands are non-standard, however it's easy to use and learn, and it does produce stand-alone *.COM files.
ZBASIC - A public domain release of a commercial product. ZBasic is easy to use and is a near-industry standard version of Basic. The full version will produce stand- alone *.COM files, this feature has been removed from the PD version. Both come complete with full instructions.