At this call I’d like to talk about ODK 2 docs, as usual. They’re live at docs.opendatakit.org/odk2 and I want to encourage everyone to start using those as the canonical version, as well as provide some instructions for how to contribute, and discuss some areas that might need work (both in my opinion and as a question for the community).
They are similar in that they both will enable decentralized communication between 2 (or more) mobile devices in a disconnected environment. This would pretty much be where the similarity ends. The way Collect transfers data is different from how the ODK2 tool suite transfers data, so the 2 projects will end up looking quite different. You can read more about how the data transfer process is different here. Selecting the Appropriate Tool Suite — ODK-X Docs