AVIX for Cortex-M3 is fully CMSIS based and available for the IAR EWARM development environment using the ICCARM compiler and the KEIL MDK development environment using the ARMCC compiler on a single license.

BeRTOS is an open source operating system designed for real-time applications equipped with driver and libraries for the rapid development of embedded software.

• TCP/IP stack implementation (based on lwIP) + TFTP server module
• XModem protocol
• Keytag (for 125KHz transponders)
• CRC16
• PID Controller
• and more...
  

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Contiki is the open source operating system for the Internet of Things.
Contiki runs on networked embedded systems and wireless sensor networks.
Contiki has been used is a variety of projects, such as road tunnel fire monitoring, intrusion detection, wildlife monitoring, and in surveillance networks.
Contiki is designed for microcontrollers with small amounts of memory.
A typical Contiki configuration is 2 kilobytes of RAM and 40 kilobytes of ROM.
Contiki provides IP communication, both for IPv4 and IPv6.
Contiki support also 6LoWPA.
Contiki and its uIPv6 stack are IPv6 Ready Phase 1 certified and therefor has the right to use the IPv6 Ready silver logo.
Contiki is developed by a group of developers from industry and academia lead by Adam Dunkels.
The Contiki team currently has members from Cisco, Redwire LLC, SAP, SICS, and others.

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FatFS Open source (BSD) Free.
FatFs is a generic FAT file system module for small embedded systems.
The FatFs is written in compliance with ANSI C and completely separated from the disk I/O layer. Therefore it is independent of hardware architecture. It can be incorporated into low cost microcontrollers, such as CORTEX Mx, AVR, 8051, PIC, ARM, Z80, 68k and etc..., without any change. Petit FatFs module is also available here.

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Open source, portable, preemptive, reliable, real-time kernel that can be used in commercial applications. Royalty-free commercial licensing. Support and development services available. SafeRTOS, IEC61508 certified sister product also available.
FreeRTOS for STM32VL-Discovery board and ATOLLIC TrueStudio is here
FreeRTOS for STM32F4-Discovery board and ATOLLIC TrueStudio is here
FreeRTOS for STM32F4 M4F demo board and IAR is here
FreeRTOS Demo for the STM32L152 Cortex M3 Microcontroller and IAR is here
FreeRTOS for STM32F107 Connectivity Line Cortex M3 and Rowley is here
FreeRTOS for STM32F103 Cortex M3 and IAR is here
FreeRTOS for STM32 Primer Cortex M3 and RAISONANCE is here

safeRTOS OpenRTOS
In Italy safeRTOS and OpenRTOS are distributed by FenWay Embedded System

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In Italy HCC is distributed by FenWay Embedded System

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PowerPac   
A full-featured real-time operating system combined with a high performance, versatile file system. It includes sample projects and board support packages for most STR7x and STR9x devices, a priority controlled and extremely dense real-time operating system with fully interruptible kernel that can be used in time critical situations.
ROM: 2-4K
RAM: 51 bytes
In Italy IAR is distributed by FenWay Embedded System

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IXXAT is one of the leading suppliers of data communication technology for the automation and automotive industry. IXXAT CANopen® software and tools are used by different companies worldwide. In terms of the OSI model, CANopen® implements the layers above and including the network layer.
The CANopen® protocol software from IXXAT, which has been available for many years, has proven itself already also in numerous applications with STM32 and STM8 microcontrollers.
The CANopen protocol software conforms to the CANopen specification CiA 301 Version 4.02 and is available as Slave software and as Master/Slave software. Adapted software packages are already available for a large number of STM32 microcontrollers. Support for not yet supported microcontrollers can be implemented on request.

IXXAT also offers a protocol software to develop DeviceNet devices as well as tools and drivers for testing and analyzing DeviceNet devices and networks with STM32 and STM8.
The DeviceNet Slave Protocol Software contains all important functions required to implement a DeviceNet slave device in accordance with the current DeviceNet specification from ODVA.
The SAE J1939 CAN driver and the protocol software allow quick and easy development of J1939 devices with ST microcontrollers.
Three versions of the SAE J1939 protocol software are available from IXXAT: "Micro" version for 8 bit systems, the "Single Channel" version for applications with one CAN channel, the "Multi Channel" version for applications with more than one CAN channel.

CANopen Evaluation Kit for STMicroelectronics STM32F107 is here

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uC/OSII   

Milos RTOS, a free and complete pre-emptive Operating System specially designed to run on ARM machines.
This OS is free and could be download in source code format.
Please visit the Milos RTOS official site at http://www.milos.it

Milos is a full preemptive operating system. Although very complex systems can be built around it, the core is lightweight and very easy to understand.
Milos was born around 1999, initially developed to be used with small 8 bit microprocessor as 8051 and others. With time, the system grown, becoming part of very larger systems.
Now the third version of the operating system is released, and becomes open source, distributed with under the GNU license. So everyone is invited to download it, to use it, and to contribute too.
Features

• Full preemptive.
• Interrupt handling.
• Unlimited threads.
• Simple but efficient heap management (with defragmenter).
• Synchronization objects.
• Device drivers management.
• Timers.
• Debug terminal.

See also: http://www.artekit.eu/

NexGenIP   
NexGenGUI4   
NexGen SURFon   

Company (based in France) just released an embedded TCP/IPv4 & v6 stack named “CycloneTCP”.
This stack conforms to RFC standards and supports natively FreeRTOS.
This stack have ports to many MCUs, and especially for STM32 series.
It is available under open-source license (GPLv2) or commercial license.
This stack can be ported to all commercial RTOS available on the market.
On website a real online demo running on STM32F400 with FreeRTOS.
Brochure is here.
On line demo is here.

PolarSSL Open source (GPL2) or Source Free or license
PolarSSL is an SSL library written in ANSI C. PolarSSL makes it easy for developers to include cryptographic and SSL/TLS capabilities in their (embedded) products with as little hassle as possible. It is designed to be readable, documented, tested, loosely coupled and portable.

RTXC Quadros   

Salvo™ is the first Real-Time Operating System (RTOS) designed expressly for very-low-cost embedded systems with severely limited program and data memory. With Salvo, you can quickly create low-cost, smart and sophisticated embedded products.
In Italy SALVO is distributed by FenWay Embedded System

embOS   
Small, real-time kernel, that supports all common 8/16/32-bit CPUs. It provides all the benefits of a fully-featured, multi-tasking system through 100% identical API (e.g. low memory footprint, fast context switches, low interrupt latency, embOSView). The kernel features a start project and viewer for looking into the system from the PC (including profiling)
ROM: 3K
RAM: 52 bytes

RoweBots offers OEM developers ultra tiny Linux and POSIX compatible operating systems. The Unison Embedded Operating System is the 32 bit offering and DSPnano RTOS is the 8/16 bit offering.  Unison supports general purpose MCU, DSP and DSC 32 bit architectures with as little as 1K of RAM and 6K of flash.