Does your application require resolution independence? Simply drag and drop the small-footprint MegaSpring to your VB form, it will automatically resize all controls and fonts without any coding. All controls in the form are proportional in size, position and font size.
The Poor Man's Spell Checker is a simple, lightweight spell-checking script. The source code is written in VBScript, but you could port it to the language of your choice without too much trouble. Weighing in at around 200 lines, it's small enough to be embedded into any program, and it's free with no strings attached. It has a few disadvantages, but it should be sufficient for most applications that don't require a heavy-duty, industrial-strength, spell-checking monster. If you just need something that is straightforward and works, then this might be what you're looking for.
IIS should have this funtion built in like the FormatCurrency(). Since it does not, aspXstream has built it for you. Every e-commerce web designer has needed to use this function. Very simple, will format 10 & 11 digit numbers.
A nice way to point out some features on your website is by means of a tickertape. Not only can you show messages this way, but the ticker can also contain hyperlinks, so you can direct your visitors directly to the right place.
Kalky is a fun and simple ASP calculator that can add, multiply, subtract, and divide. In addition, Kalky keeps a log of everything you do and calculate in case you want to look back and remember that calculation you did 10 minutes ago. Nothing fancy, but a good model to build a full asp calculator off of.
Antiadbuster allows you to protect your websites from ad killers/ad busters and site grabbers. Using Antiadbuster, you can block adblocker and adbusters that block ads from your websites. Antiadbuster is currently available for PHP and ASP.
a1asp.atom is a free component that makes it possible to use Windows "atoms" from ASP-scripts and from other scripts/applications. Atoms can be used for an inter-application synchronization and data transfer.