Not a complete list...
Encoding
Base64 en/decoding:
python -m base64 -d [file]
python -m base64 -e [file]
ROT-13 en/decoder:
python -m encodings.rot_13
Macintosh BinHex:
# binhex to .hqx, and unbinhex .hqx to .viahqx
python -m binhex
UUencode/decode:
python -m uu [infile [outfile]] # encode
python -m uu -d [infile [outfile]] # decode
MIME quoted-printable en/decoding:
python -m mimify -e [infile [outfile]] # encode
python -m mimify -d [infile [outfile]] # decode
Quoted-printable en/decoding:
python -m quopri [file] # encode
python -m quopri -d [file] # decode
Compression
GZip:
python -m gzip [file] # compress
python -m gzip -d [file] # decompress
Zipfile extraction, etc.:
python -m zipfile -l # list
python -m zipfile -t # test
python -m zipfile -e # extract
python -m zipfile -c sources... # create
Internet
HTTP servers:
python -m BaseHTTPServer
python -m CGIHTTPServer
python -m SimpleHTTPServer
Simple FTP client:
python -m ftplib host [-l] [-d] [-p] [file-to-retrieve]
HTML Text extraction:
python -m htmllib
JSON Validator and pretty-printer:
python -m json.tool [infile [outfile]]
List POP3 mailbox:
python -m poplib
SMTP server:
python -m smtpd
Send a mail message (to localhost):
python -m smtplib
Telnet client:
python -m telnetlib [host [port]]
MIME type/extension database:
python -m mimetypes file.ext # print type for filename
python -m mimetypes -e mime/type # print extension for type
Open webbrowser:
python -m webbrowser -n # new window
python -m webbrowser -t # new tab
Antigravity:
python -m antigravity
Python
Pure-Python REPL:
python -m code
Python bytecode batch compiler:
python -m compileall
Python code profiler:
python -m cProfile