I have a few homegrown tools, the most notable is one I use to record narration for an audiobook-like podcast. I paste my script into the software, then it will go through the script one sentence at a time. I record and re-record it until I am happy with the take, then it moves on to the next sentence. When I'm done, I can download the audio as one merged WAV file.

I occasionally think about sprucing it up to offer for public use, but it's the kind of task that never reaches the top of the to-do list.