If you seek something simple, non-commandline, easy to use and with a GUI, then Capture2Text is the best I know so far. Source: over 2 years ago

Capture2Text is FOSS. It uses Tesseract as it's OCR engine, which is great as you can use different language data files to find the one that is the most accurate for your purposes. Source: over 2 years ago

Capture2Text is the simplest solution and it works surprisingly well with the Cold Steel/Hajimari text boxes... Once it runs in the background press a previously assigned hotkey and select the area on the screen to be captured. I recommend deactivating its popup window, you just want the text to be copied into the clipboard. Source: almost 3 years ago

You should have a look at Capture2Text and ShareX. They offer OCR translation (ShareX links to google translator in your browser, when you do OCR Translation, I think). Source: about 3 years ago

I just discovered this kinda cool keyboard that claimed to be private. They have two versions of it, a free one and a paid one. They claimed that their keyboard works 100% offline (talk about that later) and having no suspicious permissions. They have a honneycomb layout (and a normal one) and propose a tutorial and a game to help improving your typing faster with this new of a kind layout. Source: about 3 years ago