Please write feedback if you have an idea which tool you would like to have. Also if you have suggestions for more complex filters or something.
Already created D2 Skill calculator for Android OS: Skill calculator Diablo 2. Not sure maybe I should transform to website and create similar tool or should make more complex one with full UI still is a question. Android App has custom data for that reason algorithm is not finished for Assassin and Druid synergies.
Here some snippets if you beware to click links up
Interactive popular crafting recipes: (Suffixes now later will be Prefixes)
Just for fun without Level requirement. Guide Summary taken from D2JSP All you need to know when crafting those popular recipes.