| Low bit rate speech codec | |
| https://freedv.org/ https://www.rowetel.com/?page_id=452 https://github.com/drowe67/codec2 | |
| codec2-1.2.0 | LGPL-2.1 |
| download~alpha amd64 arm arm64 ~hppa ~ia64 ~loong ~mips ppc ppc64 ~riscv ~sparc x86 | gentoo |
| codec2-1.0.5 | LGPL-2.1 |
| download~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~ppc ~ppc64 ~riscv ~sparc ~x86 | vowstar |