STMicroelectronics' STM8 family of 8-bit microcontrollers is supported by a complete range of software tools both from ST and third-parties.
It encompasses traditional integrated development environments – IDEs with C compilers and debuggers complemented by ST's STM-STUDIO, run-time variable monitoring and visualization tool to fine tune the debugging and validation of applications.
C compilers are available from Cosmic, IAR and Raisonance, with free versions up to 32KB of code.

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STM-STUDIO-STM8
STM Studio run-time variables monitoring and visualization tool for STM8 microcontrollers
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STVP-STM8
ST Visual Programmer STM8
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FLASHER-STM8
STM8 Flash loader demonstrator (UM0462)
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STVP-LIB-STM8
STVP programming toolkit: C++ source files for creating PC programming interface
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STM8CubeMX
STM8Cube configuration and report tool
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STSW-STM8042
STM8S motor control firmware library builder
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STSW-STM8041
Configuration software for STM8S motor control kit
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CXSTM8
C Compiler and associated tools for the STM8 family
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IAR Embedded Workbench for STM8
Integrated Development Environment.
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IAR Embedded Workbench for STM8 - Functional Safety
Integrated Development Environment.
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RIDE-STM8
Raisonance branded integrated development environment for STM8 MCUs
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winIDEA-STM8
iSYSTEM's complete software development and test solution for the STM8 MCUs
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STVD-STM8
ST Visual develop IDE for developing ST7 and STM8 applications