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123 signal
Offers 24-hour online foreign exchange signals on major currency pairs, sends FX signals to email and SMS.
www.123signal.com/

Signal Processing Information Base
Project of Rice University sponsored by the IEEE Signal Processing Society and the National Science Foundation to catalog Internet DSP resources.
spib.rice.edu/

DSP Design Performance
Freely-usable Java applets for digital filter design, including fractional-sample broadband delay and high-Q notch filters, as well as standard types.
www.nauticom.net/

CUED Signal Processing Laboratory
Cambridge University Engineering Department Signal Processing Laboratory. Based in the UK.
www-sigproc.eng.cam.ac.uk/

Danville Signal Processing, Inc.
Develops and sells standard and custom products for communications, audio, and instrumentation applications. Includes product and application descriptions, documentation, developer's module.
www.danvillesignal.com/

The Scientist and Engineer's Guide to Digital Signal Processing
A textbook of DSP techniques by Steven W. Smith, 1997, 640 pages. You can download the book for free. Clear explanation and low math.
www.dspguide.com/

SPECTRUM: A Student Tool for Digital Signal Processing
A freeware Macintosh program for post-run digital signal processing.
www.wam.umd.edu/

Signal Processing using C++ (SPUC)
A collection of efficient and reusable DSP building block objects (for digital communications simulation) written in C++.
spuc.sourceforge.net/

Bores Signal Processing
Provides a range of training, eBooks and free on-line courses in DSP. Based in the UK.
www.bores.com/

Spectrum Signal Processing
Provides DSP hardware and software solutions, specialising in Software Defined Radios (SDR). Based in Canada.
www.spectrumsignal.com/