Hmm, there’s actually an app I found helpful that’s called BeneTalk. Might be worth looking on the AppStore, but I’m not sure it’s available outside of the UK. It basically runs through a lot of speech therapy techniques, and you can practice them out loud. I find it helpful to do it with someone else in the room, as I’m completely fluent on my own. Having someone else there helps me stutter, which helps me practice the techniques it trains you on.