ArinWhois.NET - A .NET client for ARIN's RESTful Whois (Whois-RWS).
NicInfo - A command line Registry Data Access Protocol (RDAP) client.
RDAP Bootstrap - A Registry Data Access Protocol Bootstrap server (Java web application).
ARINcli - a set of command-line scripts, written in Ruby, that utilize both the Whois-RWS service and the Reg-RWS service (formerly ARINr)
RWhois - a distributed directory service toolset that the community uses to provide network reassignment information to the community locally
Resource Certification (RESCERT) - a set of tools being used to set up a certificate-based repository for associations between autonomous system numbers and network allocations