Here's the problem. You've got a ton of data, and a data warehouse, data mining, or machine learning application that operates on that data. Maybe you've considered MySQL or Sleepycat, but the amount of coding required to store and operate on your data seems prohibitive. And, will these systems get you within even a magnitude of an acceptable level of performance?
Jigsaw library is a dual open source/commercial license C library, consisting of collection of persistent objects that let you represent your data in the way you've conceived it. Is your data a massive ordered map, a directed graph, or a phrase index? It's either in Jigsaw, or easy to construct with the Jigsaw primitives. The end result? You finish your application faster, with the performance and scalability you need.
We want your project to be a success, so we can help you embed Jigsaw in your application. Do you need assistance with your project? Need a specialized method not available with the Jigsaw API? How about a training session? We can also work with you on a consulting basis to do the work of integrating Jigsaw into your application.