I even posted an Ask HN asking if anyone remembered the name: https://news.ycombinator.com/item?id=8288303
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Separately, FullContact API is also another replacement.
I ran some test on the 3 of them and Stacklead was the one that could usually found the most useful information. Haven't tried Clearbit in the last 2 months though...
Not a direct replacement but I'm now adding some additional features to try to make it that. If you're an existing Stacklead customer I'd be interested in talking to you about getting your data migrated and making sure everything works as well at Hulimail as it did at Stacklead.
I'm curious as to why the company joined LinkedIn instead of pursuing the opportunity to grow StackLead. I've heard from more than a few people using it how valuable the service is and I'm surprised they are shutting it down.