Photoshop 7.0 is a legendary piece of software, but noise removal evolved significantly after 2003. With the right legacy plugin, you can still breathe life into grainy photos without spending a dime.
Originally a commercial plugin, the developer released version 1.0 for free in 2008. It features a simple two-slider interface: "Luminance Smoothing" and "Color Noise Reduction." Adobe Photoshop 7.0 Filter Remove Grain Free Download
Before looking for external downloads, you should check if the native tools can solve your problem. Photoshop 7.0 actually ships with a capable noise reduction filter built right in. Photoshop 7