Here's the answer my AI gave me, but I haven't checked for accuracy yet:

Yes, there are several open-source apps available that can perform speech-to-text transcription and editing. Here are some options:

1. OpenMic: OpenMic is an open-source audio and video recording tool with built-in speech-to-text functionality. It supports multiple languages and can be trained to recognize specific voices. The transcribed text can then be edited using the app's built-in editor.

2. Sox: Sox is a command-line tool for editing and manipulating audio files. While it doesn't have a built-in speech-to-text function, it can be used in conjunction with other tools to transcribe and edit speech recordings. For example, you can use Sox to trim or silence parts of an audio file after transcribing it using a tool like Festival or Atril.

3. Festival: Festival is a free, open-source speech recognition system developed at the University of Edinburgh. It can be used to transcribe spoken words in multiple languages and has a built-in editor for editing the transcripts. Festival also includes tools for training and customizing the system's performance.

4. Atril: Atril is another open-source speech recognition tool that supports several languages and has a built-in editor for editing transcripts. It can be used to create closed captions or subtitles for video files, as well as transcribe spoken words.

5. Kaldi: Kaldi is an open-source toolkit for speech recognition, language recognition, and speaker identification. While it doesn't have a built-in editor, it can be used in conjunction with other tools to transcribe and edit speech recordings. Kaldi supports multiple languages and has been used in various applications, including voice assistants and language learning apps.

These are just a few examples of the many FOSS (Free and Open-Source Software) apps available for speech recognition and editing. Each has its own strengths and weaknesses, so you may want to try out a few options to see which one works best for your needs.