Hi guys! If you prefer console more than GUI applications, you should try Rubuquet — Ruby powered script. It has less features than KBookOCR however it was created to provide a simple and fast way to convert PDFs or DJVu-files in TXT.
1.3.1 — preview of scaned pages, some GUI usability improvements
1.4.0 — book pages thumbnails for recognition, batch scanning option
1.4.1 — ability to save the project file to open project next time and continue working from the last saved step