A ten minute search (Google) found a half dozen decent looking free inventory control systems for Windows platforms (which always worries me, but that's a different issue). Tucows is often a good resource (thought I usually go there indirectly). I was less successful looking for something on other platforms.
If you want/need to roll your own, I strongly suggest that you get two or three of the free or demo packages and run them past your "customer" to get feedback about which features are nice, which useless, etc. Be aware (if you aren't already, of course) that you will spend 80% of your time doing screen layout and similar work, and 20% actually getting the back end system working correctly. I suggest that you front load the 20% part so you can give the customer something 'real' to look at as early as possible. (He) will then spend most of (his) time tuning things like colors, text box size and location, how pages flow to each other and all the "what it looks like" things that actually make a huge difference in the day to day use of the program. And may also have some valuable insight into actual functionality that only comes to light when the program is in use (which wraps back around to why you want to let them see some of the "commercial" packages, too).
griswolf
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