ST7

Tools

SDCC

ST forum SDCC for ST7
Sourceforge SDCC for ST7, STM8
Wikipedia Small Device C Compiler
Retargeting Compilers/assemblers
The SDCC Open Knowledge Resource
Installing Eclipse with SDCC on Windows Vista October 19, 2009
eclipseSDCC at sourceforge
Win+SDCC+EclipseHOWTO from The Software Bin Without using eclipseSDCC plugin. just configure the project for SDCC paths

From Installing SDCC Plug-in for Eclipse IDE

Download the SDCC plug-in for eclipse -- eclipseSDCC-1.0.0 from http://sourceforge.net/projects/eclipse-sdcc
Extract contents into a new folder
Browse into it and copy folders “plugins” and “features” into \eclipse\ folder. (where you installed eclipse before)
Read the help documents in \eclipse\plugins\net.sourceforge.eclipsesdcc_1.0.0\help for tips on how to create a new MCS51family(SDCC) project.

Supports both ST7 and STM8 MCUs

RCSTM8 compiler: 1KB per object

RLSTM8 linker: 4KB </dd>

Free 32KB license available for STM8

Register for C compiler license to output up to 32 Kbytes of code for STM8

RKit STM8/ST7 "Professional" Software Toolset at 990EU

Details of my STM8-lite 32K registration Rkit-STM8-Lite

STM

STM STVD ST Visual develop IDE for developing ST7 and STM8 applications

C Compiler support includes Cosmic C compiler (free 4K code size limited version for ST7 and 32K version for STM8) and Raisonance C compiler (free 32K code size limited version) </dd>