Updated to include corrections from good people in the comments section:
Of the python implementations you mentioned, the source and most frequently used is CPython (python on your list is an interpreter for python, implemented in C and executed as a native application) and is available for almost every platform under the sun. Other options:
- IronPython: .Net( .Net)
- Jython: JVM ( Java JVM)
- PyPy: Python, " ", . JIT RPython ( C), Python, .
- Stackless Python: python, C ( ), CPython.
Python ( ), CPython. , . CPython - , , - , .