Mapzen, a popular open source mapping lab, announced this week that it will cease operation at the end of January 2018. All hosted APIs and related support and services will turn off on February 1, according to a blog post announcing the news. No explanation is given for why Mapzen is ceasing operations.
Because all of Mapzen's core products are built on open source software and data, it's still possible to run Mapzen services. A separate post explains how to switch to alternative services.
Mapzen was selected by Planetizen as a top website for planning in 2016.