The OpenStreetMap Node Network Analyzer can be used to to look at and improve the quality of hiking and bicycle node networks.
Click on the links in blue to drill down to further detail.
Home page for OpenStreetMap.
Details about mapping bicyle node networks (also valid for mapping walking node networks).
Background information related to mapping walking networks in The Netherlands.
Background information related to mapping node networks in Belgium.
Describes how to simplify editing node networks in JOSM.