如果存在任何指向c#的免费Excel“助手”类库的链接怎么办?

I'm looking for any available free Excel "helper" classes that are written for .net (doesn't have to be C#). I'd like to evaluate what others consider to be useful and generic static (and non static) helper methods. Can be targeted at VSTO or regular Office automation, although that probably doesn't matter.I'm looking for any available free Excel "helpe