  Open-source software (OSS) is widely spread in industry, research, and
government. OSS represents an effective development model because it harnesses
the decentralized efforts of many developers in a way that scales. As OSS
developers work independently on interdependent modules, they create a larger
cohesive whole in the form of an ecosystem, leaving traces of their
contributions and collaborations. Data harvested from these traces enable the
study of large-scale decentralized collaborative work. We present curated data
on the activity of tens of thousands of developers in the Rust ecosystem and
the evolving dependencies between their libraries. The data covers seven years
of developer contributions to Rust libraries and can be used to reconstruct the
ecosystem's development history, such as growing developer collaboration
networks or dependency networks. These are complemented by statistics on
downloads and popularity, tracking the dynamics of use and success over time.
Altogether the data give a comprehensive view of several dimensions of the
ecosystem.
