Tool : PhotoRec
Official : CGSecurity
Use Type : Free, Open Source 

You lost your files from storage device ?. PhotoRec data recovery tool can recover your files including photos, documents and videos. This is free and opensource data recovery tool. Operating system supports include Windows, Linux and Mac. Note that, as soon as you lost your data from certain storage media, do not write any files to that media. Doing so will overwrite your previous lost data. So, while recovering from PhotoRec, do not get recovered files directly into same media, rather recover it to another media. And after recovery, move it to desired previous media or any other media. 

(Note : Link sends you to official site page)

image source : pixabay