CW Decoder Logic is a free software for decoding Morse code (CW) through audio. 

 The site is this, but it gives a privacy error, probably due to a failure to update (http instead of https).

https://www.ly3h.net/cw-decoder-logic/

Here are some key details:

Version and Release Date: The latest available version is CW Decoder Logic v1.0.0.5, released on November 10, 2016.

Main Features

• Decoding Speed: From 5 to 60 WPM (words per minute).
• Automatic CW Signal Tracking: Within a 3 KHz range, with the option for manual station selection.
• Automatic Speed Detection: The software automatically detects Morse code speed in a few milliseconds.

"Tips" Feature

 If the mouse is moved over an unknown word, a tip pops up with annotations about the word. Familiar words are separated.

Customizable Tips

 Advanced users can translate or add new tips in the "tips.ini" file in the install directory.

Improvements and Updates

• Added station selection on the waterfall.
• Improved program stability.
• Added auto squelch function and smart auto tracking.
• Increased decoder sensitivity and accuracy.
• Added speed limitation function for low and high speed.

Compatibility

 The program is compatible with Windows Vista SP2, 7, 8, 10, and requires Microsoft .NET Framework 4.5 or higher.

User Interface

The interface has been optimized to improve program speed and remembers the last program configuration, including window position and size.

Additional Functions

• Ability to send selected text to an external logger via UDP protocol.
• Optimized narrow 80 Hz DSP filter for speeds of 5 to 60 WPM.

Developer: The software was developed by LY3H and is offered for free to amateur radio (HAM) friends.