Abstract: A facility for creating custom software to analyze resource data is configured to assist domain experts in the creation of custom software. The facility obtains user input indicating one or more global inputs and one or more global outputs. The facility obtains user input creating one or more nodes, each having one or more inputs and one or more outputs, and each configured to evaluate resource data based on the inputs to produce the outputs. The facility obtains user input mapping between outputs and inputs of nodes to establish a network among the nodes. The facility evaluates each node in accordance with the established network based on the global inputs and global outputs. The facility displays the nodes and the network among the nodes.