FWIW, I am mirroring CRAN at github now, here:
https://github.com/cran

One can install specific package versions using the devtools package:
library(devtools)
install_github("cran/<package>@<version>")

In addition, one can also install versions based on the R version, e.g.:
install_github("cran/<package>@R-2.15.3")
installs the version that was on CRAN when R-2.15.3 was released.

This is not very convenient yet, because the dependencies should be
installed based on the R versions as well. This is in the works.

This is an experiment, and I am not yet committed to maintaining it in the
long run. We'll see how it works and if it has the potential to be useful.

Plans for features:
- convenient install of packages from CRAN "snapshots", with all
dependencies coming from the same snapshot.
- web page with package search, summaries, etc.
- binaries

Help is welcome, especially advice and feedback:
https://github.com/metacran/tools/issues

Best,
Gabor

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