I think that you should use some a product, which you help for testing. Whether you are tested of Web application, you should use Webload(www.radview.com). I think that it's very good tool for web testing and whether you are testing some other appz such as Visual Basic or Visual C++ application so I'm used Visual Test(www.rational.com) Attention!!! This the product is not already under development;-( That's all.
You can certainly test modules or applications with out the use of automated tools.
Generally testing should be done manually and only start to automate tests once your software is relatively stable.
More often than not the majority of automated testing is aimed at regression testing unchanged functionality in your application(s) allowing the manual testing effort to be concentrated on new and changed functionality.