uC/51 1.20.05 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The actual developer of the software is Wickenhaeuser.
We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software. The software is categorized as Development Tools. UC/51 can also be called "uC51". The most popular version among the program users is 1.2.
From the developer:
uC/51 is a series of 3 books, giving a clear overview about 8051 programming (with uC/51) and peripherals. The authors are members of Fachhochschule Bochum. The tool is a must for all, who are working with small autonomous robots. Written by members of the University of Karlsruhe the book is full of practical solutions, including full source codes for the uC/51 ANSI C Compiler.
You may want to check out more software, such as AnvSoft Flash Slide Show Maker or Chameleon LL Submitter, which might be related to uC/51.