Techniques are described for exchanging data between software applications, such as project-related data between a project management software application (“PMSA”) and an unaffiliated organizational project tracking software application (“OPTSA”). A computing architecture with multiple interacting computer systems, such as a client-server architecture, can be used to allow users of remote computing systems to access project-related data and/or functionality from other computing systems, such as a thin client computing system with limited or no local capabilities to execute software applications and/or store associated application data accessing a remote central server computing system in order to interact with a PMSA executing on the server, to interact with an OPTSA executing on the server, and/or to invoke data exchange functionality available at the server for exchanging project-related data between the PMSA and OPTSA.