The speech accent archive from George Mason University looks like a fantastic resource for linguists and speech recognition software developers alike. Samples of speech by a large selection of native and non-native English speakers are available, searchable by language/speaker or by geographical location.
The speech accent archive is established to uniformly exhibit a large set of speech accents from a variety of language backgrounds. Native and non-native speakers of English all read the same English paragraph and are carefully recorded. The archive is constructed as a teaching tool and as a research tool. It is meant to be used by linguists as well as other people who simply wish to listen to and compare the accents of different English speakers.
The post title is a reference to an encounter I had many years ago with a young boy from Oklahoma who declared that he liked our Irish accents. When we thanked him and said that we liked his accent too, he looked confused and said in his thick South Midland dialect “I ain’t got no accent!”. The perfect reminder that like so many things in life, it’s all relative!