Apps similar to CODESYS include logi.CAD 3 - Engineering Toolkit. It's paid, but 4diac and Outseal are free. Other options are LOGO! Soft Comfort, CX-One, TIA Portal and LogicLab. You can choose from more than 10 Runtime Environments like CODESYS for Windows, Linux, the web and Mac.
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.
Germany
EU
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).
GermanyEU
CX-One software allows users to build, configure and program a host of devices such as PLCs, HMIs and motion-control systems and networks using just one software package.
TIA Portal is the key to unlocking the full potential of Totally Integrated Automation (TIA). The pioneering engineering framework optimizes all planning, machine and process procedures and offers a standardized and integrated operating concept.
Eclipse 4diac™ provides an open source infrastructure for distributed industrial process measurement and control systems based on the IEC 61499 standard.
ItalyEU
Outseal PLC is an IDE in the form of Ladder Diagrams based on Arduino Board. This PLC has hardware that is open to the public, you can download and learn the electronic circuit freely and make yourself at home at an affordable price.
TIA TOOLS reads an Excel workbook that describes the CMs and EMs of your project. It checks every row, then writes the external source files TIA Portal imports.
Switzerland
straton is a flexible IEC-61131-3-based soft PLC and data processing environment for embedded platforms, developed and maintained by STRATON AUTOMATION.
FranceEU
Online PLC programming simulator for Ladder Logic and Structured Text, with live scan-cycle visualisation, HMI tools, robots and 3D factory scenarios.
Universal automation workshop for creating automation programs, generating PLC code, creating Hmis, creating pneumatic, electric, hydraulic diagram simulations, creating 3d simulation of machines.
