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Dear Colleagues, We are happy to announce a redesigned and extended webservice for remote ARP/wARP execution. In addition to the crystallographic protein chain tracing, many other functionalities of ARP/wARP are now also available online. These include: - classic protein model building starting from phases or from existing model - secondary structure building - nucleotide building - solvent modelling - ligand modelling and identification The webservice offers a registration with an email address, which provides more options to the users. For example, all jobs a user has previously submitted are now in one place, can be easily evaluated, compared or run again with different parameters. The link for the new ARP/wARP webservice is https://arpwarp.embl-hamburg.de. The former link http://cluster.embl-hamburg.de/ARPwARP/remote-http.html continues to function too. The webservice is using the current ARP/wARP version 7.6.1, which has been jointly released with the CCP4 software. The website contains links to related webservices: Auto-Rickshaw for structure solution, ViCi for ligand scaffold hopping and DipCheck for protein model validation. Your feedback, comments and suggestions are welcome. Happy model building! The ARP/wARP team at EMBL Hamburg