The nanoKeyer is an Arduino Nano based CW Contest Keyer.

Key Features (K3NG Firmware):

CW speed adjustable from 1 to 999 WPM
K1EL Winkeyer interface protocol emulation
Supported by major logging apps (e.g. N1MM, HRD, etc. in K1EL Winkeyer mode via USB port)
SO2R compatible through K1EL Winkeyer 2 protocol emulation
Command mode for using the paddle to change settings, program memories, etc.
PS2 Keyboard Interface for CW keyboard operation without a computer
PTT with configurable lead, tail, and hang times
Up to 12 memories with macro and serial number support
QRSS and HSCW
Iambic A and B, Ultimatic and Bug mode
Farnsworth Timing, Autospace and Wordspace Adjustment
Keying Compensation, Dah to Dit Ratio, Weighting adjustment
Non-volatile storage of most settings
and much much more….

https://nanokeyer.wordpress.com/nanokeyer-info/

$10 Computer Headset on Kenwood TS-590s

http://charlessocci.com/2015/04/05/10-computer-headset-on-kenwood-ts-590s/

LY3H CW decoding software

Features:
Speed 5 – 60 WPM
Auto tracking CW signal in 3 KHz range or manually select the station.
Auto speed detection in few msecs.
“Tips” feature. If mouse moved on unknown word, tip popups with annotation about this word.
Also familiar words are separated.

For advanced user: In install directory there is a “tips.ini” file.
User can translate content or add new tips if wanted using following format:
“word”,Tab”annotation”;Enter

This is free software for my friends (HAM)

73! de LY3H

http://ly3h.net/?p=550