What are some alternatives?
When comparing MapKit JS and OpenLayers, you can also consider the following products
Swarmly - Waze for people. See where everyone is in realtime
AWS Snowball - AWS Snowball is a petabyte-scale data transport service that uses secure devices to transfer large amounts of data into and out of the AWS cloud.
MapJam - MapJam is a web and mobile map publishing platform that allows businesses, organizations, and people to create useful, personalized maps.
Net Solutions - Net Solutions is a solution providing company that gives you the experience of getting the desired software products to develop in less time with more feasibility and reliability.
OpenStreetMap - OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
Fluper - Fluper: Top Mobile App Development Company in USA, UK, UAE & INDIA that Specialises in iPhone (iOS), Android & Web App Development Services at Affordable cost.