LiveTrigger is described as 'com helps live music insiders (bands, venues, bookers) to find, connect & book shows with new bands, venues and bookers, all over the world!'. There are three alternatives to LiveTrigger, not only websites but also apps for Android, iPhone and Blackberry. The best alternative is Bandcamp, which is free. Other great sites and apps similar to LiveTrigger are ReverbNation (Freemium) and Show4me (Freemium).
Show4me is a music interaction network for music lovers, fans, musicians, music creators, bands, managers, concert promoters, and other music pros. It's an ad-free hub for consuming music and music content, monetizing music and shows, and interacting.