Links     (Rev 22Jan2013)
Lab test equipment -
        Tulsa's  lab test equipment information
      
Beige Bag Software - Full version of Spice (Analog and Digital) about $60.00 or $100.00 (depending on version) - Trial versions are available.
        http://www.beigebag.com/pricing_other.htm

MathWorks - Student version of MatLab and Simulink about $100.00 ( now I believe the Control Toolbox and the Signal Toolbox are included )
        http://www.mathworks.com/academia/student_version/

Cadence - Evaluation version - no cost (OrCAD PCB Designer Lite DVD / Download - Fill in some personal info and the download will be enabled via your email - this can legally be copied by anyone, but has limitations in circuit size and function.  Note that it is 1GB file - you can request a DVD by mail, but there may be a charge.  The FREE download might take an hour.)

        http://www.cadence.com/products/orcad/pages/downloads.aspx#cd

or you can try downloading the Cadence zip file from here:  Download (1Hr?)

    Unzip ("Extract All"), then run the program "setup.exe" in the extracted root directory of:  "16.6_OrCAD_Lite_All_Products\Lite Full\Disk1". 
    During the setup specify the installation path/folder (i.e., C:\ or maybe C:\Program Files\, etc.).
      
        Here is a .pdf file that gives a very brief introduction on how to use Cadence OrCAD 16.6 Capture CIS Lite:  Introduction to Cadence OrCAD
(Note that much of the information applies to using earlier versions.)

Derive (last version was 6.1).  Derive is a very intuitive and easy to use symbolic math program - a similar programming capability is included in the student version of MatLab, but it is not as intuitive) - Discontinued by TI - Some 'Free' downloads of Derive 6 and 6.1 are available online.  (Small program size - Windows and DOS only - See Dr. Bell for more information)