Code commonly flows downstream, from an open-source project into an organization’s own products. Upstreaming is the process of reversing that flow—contributing code back to an open-source project.

Despite many open source projects being included in for-profit software and devices, generally without compensation outside of a simple acknowledgment, the system mostly works reliably.

SourceForge's distasteful junkware-pushing antics have soured open-source projects on the one-time free software titan.