Wu is small command-line application that retrieves weather data from Weather Underground (including current conditions, historical data, forecasts, active alerts, and station lookup). The program is designed to be extremely fast and generally compliant with the Unix philosophy. Wu is written in Go, and requires a Go compiler to build from source.
vded is a simple REST-type method for tracking deltas of ever-increasing values (although it handles resets, etc., pretty well). It is meant to accept submissions of values which increment, then determine the delta between that value and its predecessor, as well as figure the rate over time.
syslog2couchdb is a tool that converts syslog messages into JSON documents and stores them in a CouchDB database. It inserts JSON documents in bulk mode for best performance, and stores messages in memory before connecting to a database. A timer periodically triggers an insertion to avoid keeping data in memory for too long.