php-jsonq provides an easy, yet powerful way to build queries for any JSON data (or PHP data structures for that matter, which are a step away). This has a variety of useful applications – data migration, API response filtering, complex configurations manipulation, and so on, and so forth.
“Why you should stop using product roadmaps and try GIST Planning” is an interesting look at project management. While I don’t GIST is easily implementable in most companies, mostly due to the change resistance, familiarity and tools, I still think it’s an interesting approach that deserves attention.
Metabase is an Open Source business intelligence and analytics tool. It supports a variety of databases and services as sources for data, and provides a number of data querying and processing tools. Have a look at the GitHub repository as well.
And if you want a few alternatives or complimenting tools, I found this list quite useful.