Sonnet Lite

Sonnet Lite Version 11.53 is a free feature-limited version of Sonnet's professional Sonnet Suite, which provides EM analysis to hundreds of companies across the globe. Many major manufacturers of high-frequency components and boards depend on Sonnet to analyze their predominantly planar high-frequency designs from 1 MHz through several THz. You can download it right now - it's FREE!

Key Benefits of Sonnet Lite

• Most accurate, reliable planar EM software in the world
• Easy to learn with clear tutorials and online help
• Fast and efficient
• It's Free!

(Source: http://www.sonnetusa.com/products/lite/)