For new designs we recommend using STM32CubeIDE instead of Atollic TrueSTUDIO. There will be no new releases of TrueSTUDIO.

TrueSTUDIO is used by large corporations, small- and medium-sized companies,
independent developers, researchers, students and hobbyists
all around the world.
Quick facts about Atollic TrueSTUDIO for STM32
Free to download and use even for commercial projects
No license system, no nag ware or commercial banners
Extensive STM32 device and board support
Video tutorials, documentation and discussion forums available
FEATURES
STM32-focused IDE
Supporting STM32 devices and development boards.
Open Standards
Built on Eclipse, CDT, GCC and GDB. Simple to extend.
Compile & Build
Highly optimizing C/C++ compiler, assembler, linker and more.
Editor
Code editing, navigation, styling, structure visualization and more.
Build/Memory Analyzer
See the RAM and FLASH memory utilization from your latest build
View total size, used and free memory.
Stack Analyzer
Calculates the stack usage based on the compiled and linked program, and presents stack usage information to help you find problems.
Single and multi-core Debug
Supports popular debug probes such as ST-Link, SEGGER, P&E micro.
Project Management
Project wizard, importers, configuration tools and more.
Hard Fault Analysis
Quickly find the Why, What & Where of hard faults. See why the fault occurred, and go directly to the offending code and affected registers.
Version Control
Version control client for Subversion (SVN), Git and CVS.
Trace & Profiling
Take STM32 debugging to a new level with these real-time visualization tools. Trace data, events, exceptions, memory history and more.
Bug Tracking
Integrated client works with Bugzilla, Trac, Mantis, and more.
RTOS-aware Debug
See the status of RTOS objects such as semaphors and mutexes during debug. Support for FreeRTOS and seven other RTOSes.