I think RUP (Rational Unified Process) is the best of them, but it is not a standard but as Rational said:
“The Rational Unified Process? (RUP) is a Web-enabled software engineering process that enhances team productivity and delivers software bestpractices to all team members. RUP is an easy-to-use online mentor that makes process practical by providing extensive guidelines, templates, and examples for all critical e-development activities.”
also it’s not free. http://www.rational.com/products/rup/faq.jsp
The spiral model is one of the most used today. Variations like RUP and a lightweight method such as eXtreme Programming (XP)both use an iterative approach. I strongly recomend RUP but it is very expensive, so I will give information for XP.
First download from http://www.pmi.org the Project Management Body of Knowledge (PMBOK) The 1996 version is free and very good starting point for thew spiral method.