For R there is KNIME Interactive R Statistics Integration under KNIME & Extensions group and KNIME R Scripting extension under KNIME Community Contributions - Other group. Don’t know what Windows binaries extension is for
What can help you in extension/integration/node search and install is KNIME Hub where you can see which node belongs to what extension (and much more!). Check it out
Additionally there is great topic in this forum regarding R and KNIME which can help you as well:
