PCB File Formats and Specs
There has been renewed interest by the IPC to try and revive the IPC -2581 PCB file format since Mentor acquired Valor and now own the ODB++ format.
As an EDA vendor who is looking into finding a good universal PCB file format for running some post-layout Signal Integrity validation checks I’m very interested in how the IPC-2581 spec is holding up among users. The ODB++ file format is a great format but Valor use to be a lot more open with the spec than Mentor has been with it. They say they have put it up as part of their Open Door alliance program but we’ll see how it works out.

