Eclipse was founded as Eclipse Inc. in 1990. Intuit acquired it in 2002, Activant acquired it in 2007, and it became part of Epicor when Epicor and Activant merged in 2011. Epicor also owns Prophet 21, another distribution ERP.
Eclipse is designed for electrical, plumbing, HVAC, and PVF distributors. Its functional areas include sales and counter order entry, inventory and purchasing with multi-branch transfers and vendor rebate tracking, wireless warehouse management, job management, financials, eCommerce, business intelligence, document management, and EDI. It can be deployed on-premises or in the cloud, with Epicor's cloud option hosted on Microsoft Azure. Independent sources describe it as running on a MultiValue database, Rocket UniData.
That is important context. Eclipse is a capable, actively developed system with deep roots in trade distribution. The more useful question is whether it is still the best fit for how your business operates and where it is going.