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compiler    

SDCC ANSI C compiler
SDCC is a Free ware , retargettable, optimizing ANSI - C compiler. The current version targets Intel 8051 and recently the Zilog Z80 based MCUs, it can be retargeted for other 8 bit MCUs or PICs. The entire source code for the compiler is distributed under GPL. SDCC uses ASXXXX & ASLINK a Free ware, retargettable assembler & linker.
preview: http://sdcc.sourceforge.net  

compiler    

SourceForge - Compiler
SDCC is an open source retargettable, optimizing ANSI - C compiler. The current version targets the Intel 8051, Zilog Z80 and Dallas 80C390 MCUs. Atmel AVR support coming soon.
preview: http://sourceforge.net  

core    

Free 8051 IP Core
The 8051 IP Core was developed in cooperation with the Arbeitsgruppe CAD / TU-Wien. This processor core is binary compatible to the well known 8051 processor from Intel. Our 8051 IP core is available as a synthetizeable circuit description (VHDL).
preview: http://www.oregano.at  

buyers guide    

8-bit Embedded Resource Catalog 2006
Catalog of hardware, software, and services for 8-bit controllers - AVR, PIC, ZiLOG, etc.
preview: http://www.eecatalog.com  

software    

CamelForth/8051
CamelForth/8051 is an ANSI compliant Forth system for the Intel 8051 family of microprocessors. It includes the Forth kernel, interpreter, and compiler, all of which reside on the 8051 processor.
preview: http://www.zetetics.com   date: 8/19/1999

emulator    

MetaLink In-circuit Emulator Software Demos
A Demo is a special version of our host software that simulates the capabilities of the hardware. This allows you to interact with the Demo to experience first hand the emulator's User Interface and feature set. MetaICE-XF 8051 emulator Demo iceMASTER-SF and MetaICE-TA 8051 emulator Demo iceMASTER-PE, iceMASTER-RA and iceMASTER-RB 8051 emulator Demo
preview: http://www.metaice.com  

rtos    

FreeRTOS - Realtime Scheduler
FreeRTOS.orgTM is a portable, open source, mini Real Time Kernel - a free to download and royalty free RTOS that can be used in commercial applications. Ports exist for many different processor architectures and development tools. Each official port includes a pre-configured example application demonstrating the kernel features, expediting learning, and permitting 'out of the box' development. Free support is provided by an active user...
preview: http://www.freertos.org