Currency calculator & List

I need a custom currency converter/calculator plug-in which allows me to manually enter value of each rate. Something similar to [login to view URL] and of course a table list of all currencies, It should have 2 widgets , one for calculator form and one for list of currencies or I could include it in template by tag or iframe. a website smilar to [login to view URL] is what I have in mind.I'm using WordPress so it's very flexible to integrate other scripts in template. so if you can't write WP plug-in, give me a php script I'll integrate it myself. Thanks in advance.