Python one-line HTTP server

python -m SimpleHTTPServer 8000

will serve the contents of the current working directory over HTTP on port 8000.

If you use Python 3, you should instead write

python3 -m http.server 8000

See the SimpleHTTPServer module docs for 2.x and the http.server docs for 3.x.

By the way, in both cases the port parameter is optional.