Not really a stack, only database, I'll speak about Postgresql
The basics, PostgreSQL is free, open-source and community powered (not an enterprise selled or bought by another one). It works on a lot of systems, Mac-Linux-Windows and it's easy to start.
You love schema-less in Mongo, with Postgres you can define a column as JSON content - and you can extract some content directly in SQL;
Your tables become too heavy, you can user partiton-table to make a virtual table for each month (for exemple)
You import JSON or XML file, you can use Foreign Data Wrapper to select these data directly in SQL
You want to build map, you can use the geospatial extension PostGis
They'is community event and talks in major open-source events
It's available on major hosting or SAAS
You can use heritage in your tables.
SQL is too complex? You can write some procedure and trigger with perl or python.
A table can INHERITS from another (yes, like OOP classes)
You've awesome stuff like channel with LISTEN or rights for only one column in a table, fulltext-search or define your own indexes.
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Not really a stack, only database, I'll speak about Postgresql
The basics, PostgreSQL is free, open-source and community powered (not an enterprise selled or bought by another one). It works on a lot of systems, Mac-Linux-Windows and it's easy to start.
You've awesome stuff like channel with LISTEN or rights for only one column in a table, fulltext-search or define your own indexes.