You can download ST Toolset 4.03.1200 from our software library for free. This free program is a product of STMicroelectronics. The software is included in Development Tools. Our antivirus check shows that this download is clean.
From the developer:
ST Toolset includes the ST Visual Programmer (STVP) programming interface, ST Visual Develop (STVD) and the ST Assembler Linker. ST Visual Develop (STVD) provides an easy-to-use, efficient environment for start-to-finish control of application development – from building and debugging the application code to programming the microcontroller.
You may want to check out more software, such as ST-Links SpatialKit, STM32 ST-Link Utility or Delaware St. John - The Curse of Midnight Manor, which might be related to ST Toolset.