Data Becker
en.wikipedia.org
en.wikipedia.org
Data Becker also had lots of serious software, shareware and full versions. There were shelves full of it in electronics markets.
Also, some of the best PC books for amateurs were from Data Becker. I got one for Christmas that explained everything, from the hardware components to using MS DOS.
For example: https://gitlab.com/amigasourcecodepreservation/amiga-graphic...
Bought it in person in that building pictured there.
I remember buying a Data Becker product for cold, hard-saved-up pocket money for use with what was my first (or was it my second? Hard to tell after the decades ;)) CD writer, it was named "DER GROSSE CD-KOPIERER" ("The great CD-copier", roughly). First thing I wanted to do was use it to make a backup copy of its own installation medium, a CD-ROM containing a win32 application of only a few MBytes in size, but with the medium having had more than its nominal max. capacity of 650MB "recorded" on it regardless. It did not support that, because recording more than that amount of data mandated the use of Disc-At-Once recording mode, which "DER GROSSE CD-KOPIERER" failed to implement. So they made their amazing(ly bad) software solution to copy CDs deliberately unable to copy the very CD that program was distributed on.
Needless to say, I never considered buying any of their products again after that.