pg_rational implements precise fractional arithmetic for PostgreSQL. Perfect for exact arithmetic or user-specified table row ordering. Holds values as big as an integer, with matching precision in the denominator.

pg-rrule can expand recurrence rules (RRULE) as defined in the iCalendar specification (RFC 5545). It allows expanding RRULEs into concrete occurences as timestamps, which can then be queried against.

pg_similarity is an extension to support similarity queries on PostgreSQL. The extension consists of:

pg_statviz is a minimalist extension and utility pair for time series analysis and visualization of PostgreSQL internal statistics. Created for snapshotting PostgreSQL's cumulative and dynamic statistics and performing time series analysis on them. The accompanying utility can produce visualizations for selected time ranges on the stored stats snapshots, enabling the user to track PostgreSQL performance over time and potentially perform tuning or troubleshooting.

This extension implements extension whitelisting, and will actively prevent users from installing extensions not in the provided list. Also, this extension implements a form of sudo facility in that the whitelisted extensions will get installed as if superuser. Privileges are dropped before handing the control back to the user.

PostgreSQL extension to quickly calculate facet counts using inverted indexes built with roaring bitmaps. Requires pg_roaringbitmap to be installed.