I am currently developing software around the tag opening_hours=*:
- evaluation tool
- Map showing nodes with opening_hours
- Visualization of the data quality and growth over time
- Checkout the opening-hours organization on GitHub for more
More information, including contact information can be found here: 
PS: I use other accounts to map the real world.
I read the following Mailing lists:
I usually just read the subject of threads and then ignore the thread if it does not interested me.
- OSM forum: I might search for opening_hours related threads now and then but do not rely on it. Just send me the link to a thread if you think I would be able to contribute something to the discussion.
If you want to write me directly, either write me an email or use the messaging system from OSM.
All my direct mail correspondence is GPG signed. If it is not signed, it is not from me.
PGP public keys
Here are the PGP keys which I use:
pub 4096R/BF1A40F8 2014-06-19 [expires: 2017-06-18] Key fingerprint = EDE1 371D 1B87 D28D A5E8 0515 86FD 980B BF1A 40F8 uid Robin Schneider <email@example.com> uid Robin Schneider <firstname.lastname@example.org> sub 4096R/706F6241 2014-06-19 [expires: 2017-06-18] pub 4096R/EE88E1F0 2014-06-19 [expires: 2017-06-18] Key fingerprint = C505 B5C9 3B0D B3D3 38A1 B600 5FE9 2C12 EE88 E1F0 uid Robin Schneider (Release Signing Key) <email@example.com> sub 4096R/000DF39F 2014-06-19 [expires: 2017-06-18] pub 4096R/C353C98A 2014-06-19 [expires: 2016-06-18] Key fingerprint = EF96 BC32 AC57 CFC7 2DF0 1D8C 489A 4D5E C353 C98A uid Robin Schneider (Automatic Signing Key) <firstname.lastname@example.org> sub 4096R/72551C51 2014-06-19 [expires: 2016-06-18]
All my software is GPG signed since 2014-06-19. If it is not signed by one of the keys listed above then it is not from me.