I have plenty of old audio cassettes. I want the songs of the cassette in MP3 or some other computer playable format.
Is there any software available for converting audio cassettes to MP3 or CD?
You could use Audacity.
If you save as MP3 you need to download LAME encoder from here.
I connect my cassette player or my vinyl player to a Behringer UFO202. This connects via USB cable to my Windows PC. On Windows I run Audacity. I set the input levels appropriately - the main thing is just to make sure there is no "clipping". This setup works very well. Audacity can record to mp3 or other formats. The audio quality is very good - or at least good enough for me!
The main annoyance with this is that I need to record each track one at a time, pausing the cassette player after each track.
The other thing you will need to do is manually set the audio "meta data' for each track - the artist name, track #, track name, album name, etc. Audacity prompts you to do this when you export the track to mp3, or you can also use software like VLC player to do it after the mp3 has been created.