Hello, we don't allow sharing of our modding tools off-site. This currently stays for now, it might or might not ever change.
As for the mods, you should probably contact their authors (We do hold the rights to them, however they at any time are able to decide where their content is published, on-site or off-site).
We provide our site for people to upload their mods, as you can see in the play history. We also still have plans for the upcoming Mod Bakery, which will be the easiest & most accessible to download/upload mods in the future.