LyricStudio

LyricStudio is a songwriting tool that suggests lines and ideas as you write, with rhyme help, a built-in thesaurus and suggestions tailored to your genre and theme, rather than generating whole songs for you. It supports real-time collaboration with co-writers and says you keep full copyright of what you write. It's aimed at beating writer's block for everyone from beginners to working rappers and topliners, and there's a free plan with paid upgrades.