There are 3 repositories under ransomware-recovery topic.
Ransomware detection application for Windows using Windows Minifilter driver
All-in-One Ransomware Decryption Tools (Unofficial Mirror)
:arrows_counterclockwise: Ransomware recovery app for Nextcloud
Recover files encrypted by Nelasod ransomware with plaintext/ciphertext pairs
Prevention against Ransomware attack, an automated implementation which help to prevent ransomware attacks
BulWark, BulWark2, BulWark7 Ransomware Recovery Tool.