I'm going to post the link to what's left at the D&D Tools website as well as their latest (last?) post, but I'd like to make some observations first.
The D&D Tools website was up for 5 years and it's only now that WotC has gotten around to a "Cease & Desist."
It's not like it was a hidden website. It's Alexa ranking is 114,870. For comparison purposes, ENWorld comes in at 44,688 and The Tavern at 237,743. It's highly doubtful that WotC had no idea that D&D Tools existed. (Google is, of course, #1)
Is it that the 3x era OGL rules that were referenced were too close to 5e? Or was there a fear that the current OGL could allow D&D Tools to replicate the 5e rules?
Just some thoughts. In any case, here's the last post at the D&D Tools site...
D&D Tools – End of an Era...
TGG here. As you have probably gathered, we have received a Cease and Desist letter from WotC (well, from a law company under WotC rule). I'd like to take some time now to comment on this.
I started D&D tools some five years ago as a tool for me to find "all the feats that affect criticals". From then, it grew up a lot, both in content and audience.
At the time of this letter, the site served roughly 1.000.000 pages a week.
Everything was interlinked with each other. Feats listed requirements as links. You could find what a class had for prerequisite and click it right away. Wanted to know what spells are there available for a class in campaign settings? No problem. Lots and lots of filtering and searching.
At November 14, 2014, I've received a letter requesting that we put the site down. As of now I have to comply, since I have neither time nor law skills nor resources to do otherwise. Also, I'm not allowed to post the letter itself here.
... about future?
First of all, the site itself is open source project. The sources are my intellectual property and I'm free to share them as I wish. About a year ago I created a repository at github – https://github.com/dndtools/dndtools. The setup notes might not be up to date, but it's possible to get it running with OGL contents. Since it was there long before the C&D letter, I feel free to share the knowledge.
Second, there is also great mobile app for android a Google Play (sorry iPhone users). It comes with full OGL contents. If you are friends with Uncle Google or Web Archive, you might even find a more interesting database for it. I myself cannot claim to be the creator of it, so please do give some love to the author on the app page!
Third, since the sources codes are available for public use and the database itself was distributed among users, there is nothing in my power to prevent others to try to resurrect the site.
I want to thank very much to all the people who put a lot of effort to see the site grow! Without you, it could never have grown into what it did. Thanks!
I'd also like to say something to WotC. The game you created is great. I spend a lot of time playing it. You have moved to 4e and then 5e. Why do you try to destroy what your fans have created? Things that can help players, that encourages them to play more? (I'm talking about all the sites that went down over the years) You'd better invest the money into creating something yourself than to spend it on law companies...