Trade costs, broadly defined, limit interaction between far-away economic agents and motivate them to concentrate in close proximity to one another. The gravity equation, which assigns a large role for geographic distance as a determinant of trade costs, has been remarkably successful in explaining patterns of international and international goods trade between firms, services trade, individual mobility and migration, and even scientific collaboration. It is unclear, however, why distance is relevant for sectors in which direct trade costs are zero. We study patterns of interaction when the good in question is ``weightless'' using data from the open-source software industry. We find that importing other software packages as dependencies is at most weakly correlated with distance. By contrast, collaboration between different developers on the same piece of software is strongly decaying with distance. These results suggest that geography continues to matter for goods and services where collaboration is frequent and deep.