Accel-KKR has made an investment of undisclosed size in On Center Software, which markets software for the construction industry. Rob Palumbo, managing director at Accel-KKR, said his firm believes "there is substantial opportunity for expansion in software and services in the construction industry." It's a continuation of a trend by the investment firm to put its money in specialized software companies, many connecting with financial applications. Earlier this year, it acquired the former Sage NonProfit Solutions, and created the company now known as Abila, and it invested in SwiftPage to finance that company's acquisition of Act and SalesLogix from Sage. It also purchased a majority interest in supply chain software company Accellos in October 2012. Based in The Woodlands, Texas, On Center markets estimating and project management software and has been in business since 1998. On Center integrates with a number of packages including Sage 300, the former Timberline Office. It also links with Cert-In Software Systems, Roger Shaw & Associates, and Prime Estimating Software and Services. Sage's construction and real estate folks have shown confidence Sage will keeps its applications in this area. But you'd have to think Accel-KKR has made or will make a bid.