Simulation Tool links:

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1). Keil software used to compile embedded-C code (for atmel 8051 family )
feel free to implement the form,
Download Link
https://www.keil.com/demo/eval/c51.htm

click the below link to know how to use keil software
VideoTutorial
http://www.youtube.com/watch?v=PSB6dG2cfKk&feature=fvsr
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2). ModelSim Tool used to simulate the VHDL programs
Download Link
http://www.altera.com/products/software/quartus-ii/modelsim/qts-modelsim-index.html

click here to see the modelsim video tutorial
VideoTutorial
http://www.youtube.com/watch?v=VTMelKXXmho
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3). Atmel studo 6 tool to compile more atmel family controllers(ATmega series etc., )
Download Link
http://www.atmel.com/tools/ATMELSTUDIO.aspx

click here to see the atmel studio 6 video tutorial
VideoTutorial
https://www.youtube.com/watch?v=9QlDSNeuAdY
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4). Microchips MPLAB IDE tool to simulate the PIC controllers etc., Download Link
http://www.microchip.com/pagehandler/en-us/family/mplabx/

click here to see the video tutorial
VideoTutorial
https://www.youtube.com/watch?v=S1QCZW92fU4
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5). Quartus II tool to simulate the Altera FPGAs
Download Link
http://www.altera.com/products/software/quartus-ii/subscription-edition/qts-se-index.html

click here to see the video tutorial
VideoTutorial
https://www.youtube.com/watch?v=Ef89wnpaFCw
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6). Xilinx ISE Design Suit 13.4 to simulate Xilinx FPGAs
Download Link
http://www.xilinx.com/support/download/index.htm

click here to see the video tutorial
VideoTutorial
https://www.youtube.com/watch?v=Ob7B6x5g6tw
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7). Proteus total circuit simulator for controller based circuits
Download Proteus 7.4
http://english.eazel.com/lv/software/download/kl671217.htm

click here to see the video tutorial
VideoTutorial
https://www.youtube.com/watch?v=yt7Bhhvo-hU