GeoJSON Lines (geojsonl) is a simple, newline-delimited variant of GeoJSON that allows large datasets to be loaded with a much lower memory footprint and easily integrate with traditional text-based tools. Interline OSM Extracts now provides geojsonl, along with a small but growing number of tools.
We've encountered many practices that can help complex and collaborative open-source projects survive and thrive. This blog post provides a tour through many open-source practices, particularly ones that are helpful for aging but popular software packages like OpenTripPlanner.