Isobuster is described as 'Low cost utility to recover data from damaged, scratched, or otherwise defective discs. Highly specialized but still easy to use to read damaged CDs, DVDs, Blu-Ray or HD-DVD media. Free version has some limited functionality but is worth it to attempt data recovery' and is a hard disk recovery tool in the os & utilities category. There are more than 10 alternatives to Isobuster for a variety of platforms, including Windows, Linux, BSD, KDE Plasma and Oracle Solaris apps. The best Isobuster alternative is K3b, which is both free and Open Source. Other great apps like Isobuster are UltraISO, CDCheck, PassFab for ISO and Iso Master.
IsoBuster recovers data from damaged CDs, K3b authors new CDs. These are COMPLETELY DIFFERENT tasks.