A few software components which are handy in the right situation. Javascript Currency Conversion. Online image manipulation.
Your Currency Converter is a very handy little javascript plugin which automatically converts prices to different currencies. At the time of writing it is the only component I could find which is pretty much drop in and work. All others required a fair bit of work. However I would suggest treating this component with caution. I could get no response from their support, the HTML/JavaScript is non-compliant and there are a couple of missing features that make it difficult to use. Especially the fact that if the script, which loads from their server, is slow to respond it can slow your site down and it can result in your site not having any currency symbols for a period. I managed to work around these flaws but do be careful. I would suggest when paying that paypal is used because much as I dislike paypal its usually fairly easy to get a refund if necessary.
Online Image manipulation. One of my clients had a need to be able to resize, crop, add watermarks etc to images they uploaded to their site. While you can do a lot of this using the .NET drawing classes it takes time and I wanted something tried and tested. This component has been perfect and has proved great value for money. Does everything I want and was easy to setup and get working. Support was also amazing. I can highly recommend this product.