Here’s a short feature-style write-up on the topic, including the GitHub link you’d likely want.
.github/
While there isn't a single "official" save editor, the most popular and versatile tools for editing renpy save editor github link
Q3: Will editing a save break my game?
Potentially, if you set variables to impossible values (e.g., player_health to a string). Always back up your original save files. The editor does not auto-backup. Here’s a short feature-style write-up on the topic,
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