These are roughly in order from most common to least common.
- Math
- Math.NT
- Teaching
- Expository
- Programming
- Story
- Math90Fall2012
- Visualization
- Math.REC
- Math.CA
- Math420Spring2016
- Sage
- Python
- GT
- Math100Fall2013
- Math100Fall2016
- 2401Spring2011
- SummerNT2013
- Humor
- Math.CO
- Math.ED
- Review
- Math170Fall2014
- Politics
- StackExchange
- LMFDB
- Technology
- Mathematics
- Data
- Math.AT
- Crypto
- Math.LO
- Math.NA
- Polymath
- Opinion
- QandA
- Math.AG
- SummerNT2014
- DataAnalysis
- NTSpring2016
- Vim
- Tech
- code4math