MeshNetics - 802.15.4 / ZigBee Wireless RF Modules
MeshNetics is a creator of easy-to-integrate 802.15.4 / ZigBee wireless RF modules and ZigBee PRO-certified mesh networking software, used by OEMs and system integrators to add wireless connectivity to their products and solutions. MeshNetics RF modules feature industry-leading range performance, long battery life and ultra-small footprint. They are designed for use in 868/915 MHz and 2.4 GHz frequency bands. MeshNetics is a single source of ZigBee modules, development tools, networking software, technical support, and design services.

Mocana NanoSSH Embedded SSH Client & Embedded SSH Server

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RTOS Guide: Selecting an Embedded OS
Selecting an Embedded RTOS? Linux, VxWorks, WinCE? What about building your own? Or comparing and contrasting commercial, free Open Source (freertos.org, eCos) vs. hardended Linux varieties? eg3.com is proud to release our 2nd edition of 'Insiders' Guide: Selecting an Embedded RTOS.' Evaluation and non-commercial copies are FREE to download.
preview: http://www.rtos-report.org  

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68HC05 Family Tutorial
The Tutorial starts with an architectural overview of the 68HC05 central processor unit (CPU). It covers memory organization, the CPU programmer's model, stack pointer operation, and the 68HC05 instruction set and its addressing modes. Once learned, this knowledge is applicable to all 68HC05 devices, because they all use the same CPU.
preview: http://rab.ict.pwr.wroc.pl  

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68HC11 Assembly Tutorial
HC12 assembly is very similar to HC11 programming. When searching for examples elsewhere, look for HC11 code too!
preview: http://www.owlnet.rice.edu  

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An Introduction to Motorola’s 68HC05 Family of 8-Bit Microcontrollers Microcontrollers
The Tutorial starts with an architectural overview of the 68HC05 central processor unit (CPU). It covers memory organization, the CPU programmer’s model, stack pointer operation, and the 68HC05 instruction set and its addressing modes. Once learned, this knowledge is applicable to all 68HC05 devices, because they all use the same CPU.
preview: http://www.freescale.com  

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Developing Embedded Software in C Using ICC11/ICC12/Hiware
Chapter 1: Program Structure A sample program introduces C C is a free field language Precedence of the operator determines the order of operation Comments are used to document the software Prepreocessor directives are special operations that occur first Global declarations provide modular building blocks
preview: http://www.ece.utexas.edu  

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Freescale's 'Embedded Learning Center'
Freescale courses on i.MX, PowerPC, and ColdFire and other Freescale architectures. The navigation of the site is very difficult, but if you poke around you can locate these 'free' tutorials, papers, and Webinars on important Freescale topics. Also includes tutorials on DSP, Zigbee, and RF.
preview: http://www.embeddedlearningcenter.com