CODESYS is not available for Linux but there are a few alternatives that runs on Linux with similar functionality. The best Linux alternative is 4diac, which is both free and Open Source. If that doesn't suit you, our users have ranked nine alternatives to CODESYS and four of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to CODESYS are logi.CAD 3 - Engineering Toolkit (Paid), LOGO! Soft Comfort (Paid) and ClassicLadder (Free).
The programming tool logi.CAD 3 is built on eclipse and its focus is on efficient and effective programming of controllers according to IEC 61131-3 for every kind of size - from Micro-Controllers to Multi-Core Industry PCs.
LOGO! Soft Comfort is software for programming simple Siemens LOGO! PLCs. Programming is done in one of two graphical programming languages - FBD (Function Block Diagram) or LAD (Ladder Diagram). Simulation and online monitoring is available.
An open source project to have a free ladder and sequential (grafcet) programming software coded in C language (to be used for educational as PLC Simulator, training, in Software PLC on PC computers or embedded platforms, ...).