Other than that, reading the blogs of the various vendors is how I keep up (using Feedly with RSS). The modern projects are Redshift, BigQuery, Snowflake, Azure DW, MemSQL, Clickhouse, YellowBrick with older projects being Vertica, Teradata, Greenplum. It's also useful to follow the "new" distributed SQL projects like CockroachDB, Citus, TiDB, Vitess, Yugabyte.
1. http://highscalability.com/
2. https://softwareengineeringdaily.com/
Other than that, reading the blogs of the various vendors is how I keep up (using Feedly with RSS). The modern projects are Redshift, BigQuery, Snowflake, Azure DW, MemSQL, Clickhouse, YellowBrick with older projects being Vertica, Teradata, Greenplum. It's also useful to follow the "new" distributed SQL projects like CockroachDB, Citus, TiDB, Vitess, Yugabyte.