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People keep asking me if buccaneer can build loops. In response to which I usually point them to 'loopy' and 'rapper', both of which do an excellent job. However, I seem to have written a loop building program by accident, and since people have been asking I guess I may as well release it. The origins of this are a library I'm writing for Coot to implement 'O'-style lego-build tools using the Richardson's Top500 protein library as a basis. The same library can also be used for C-alpha->mainchain and possibly chain growing; I also hope to use it for several new jobs in buccaneer. Using the same code for loop fitting (basically incomplete fragment matching) is trivial, and since that is a bit different from the normal approaches it seemed worth a try. It is also blisteringly fast. Is it useful? I don't know, but if you want to give it a try it is pretty simple. Please tell me how you get on. Get it here: http://www.ysbl.york.ac.uk/~cowtan/sloop/sloop.html On a related note, has anyone found sequins (the sequence validation program) to be useful? I know it works on my synthetic problems, but I don't if those cases are actually relevant to the real world. I've had no feedback about it and am looking for ways to reduce my maintenance workload.