Web mapping is the process of designing, implementing, generating and delivering maps on the World Wide Web and related products. With web mapping, freely available mapping technologies and geodata, potentially allow every skilled person to produce online maps. The cheap and easy transfer of geodata across the Internet allows the integration of distributed data sources, opening opportunities that go beyond the possibilities of disjoint data storage. Everyone with minimal knowhow and infrastructure (e.g. a GPS enabled mobile phone) can become a geodata provider. Incresingly development organisastions establish collaborative online space where users can contribute information or create their own maps.  Here is a collection of annotated links of the most popular online applications.