Most common free CAT tools:
- OmegaT – Easy to use; you don’t need to attend expensive webinars to learn to deal with. Downloadable.
- MateCat – A web based translation program, interface is easy to use.
- SmartCat – Comfortable for freelancers; you need to sign up to their website. Not such comfortable for book translating. As I know, many freelancers likes it.
- Wordfast Classic – Access and work on translation projects from a web browser.