The only mailing list for bridge software developers that I was aware of suspended operations 15 years ago. If you know of one please let me know! In the meantime I've started a new one. It's open to anyone who's interested. You can find it at
https://groups.io/g/bridge-dev
Please pass this note on to anyone you think might be interested.
Here's its description:
Bridge Software Developers bridge-dev@groups.io
A group for anyone interested in writing software for bridge, the card game. This could include software for playing, facilitating online play, scoring, analysis, training or education, player rating, storing results locally or in the cloud, or any of a multitude of things. There are no restrictions on membership, but the content will likely be of interest only to those who, at a minimum, are computer programmers who play bridge.
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New bridge software developers' mailing list
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