Mitratech Holdings Inc., a legal department software maker, has bought a portfolio of legal enterprise software products from a Washington, D.C., company. Austin-based Mitratech revealed Tuesday that it acquired CaseTrack software from Economic Analysis Group Ltd. The software manages data and electronic billing for legal departments. Financial terms of the deal were not disclosed, according to a company announcement. Mitratech, founded in 1987, employs 175 workers, including 120 based in Austin....