Among the companies lining up to back Microsoft Corp’s Windows NT are Congruent Corp, New York City, which reckons that an NT version of its GNU Unix programming tools will lower costs of developing applications for NT – ToolBuster, a suite of more than 50 programming tools, including RCS, a source code control system, and GNU Emacs text editor, will ship this month at $200; Network Peripherals Inc, Milpitas, California, which will support its Fibre Distributed Data Interface networking products under Windows NT when it arrives; XDB Systems Inc of Laurel, Maryland, which says it will develop a version of its XDB-Server, a multi-user DB2-compatible database system with mainframe-level data integrity features, for NT; and Blue Sky Software Corp, La Jolla, California, which has introduced WindowsMaker Professional 4.0 (don’t miss out the ‘n’ in there, otherwise it sounds like the Starfighter in the hands of the Luftwaffe, which was said to soar like a homesick angel and glide like a flying brick) – the WindowsMaker development environment uses a new architecture with Switch-It Code Generation Modules, and it is available now at $1,000.