We are about to start developing an ERP for small companies, and the question is if there is some free framework for ERP that I can use? Is something done to accelerate the process?
5 Answers
It's a little unclear from your question what you're wanting. If you want to use existing open source ERP software and possibly extend it (subject to the terms of its license), there's a nice list at List of ERP software packages on Wikipedia.
If you're wanting a framework that will help you write a custom ERP package, I am not aware of any such software. I'd treat it like any other software project - gather requirements, then look for pieces that can be used off-the-shelf. Some examples:
- O/RMs
- Logging frameworks like log4j (ports exist for other languages)
- IoC Container frameworks
- Pluggable architecture frameworks like MEF (.NET-specific)
And so on. Don't go overboard; use only the pieces you need.
EDIT: Apparently at least one ERP framework exists: WyattERP. If you're comfortable with Tcl, it may be worth a look.

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Look at Apache OFBiz - an open source enterprise automation software project. Also, there is a Wikipedia definition.

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Yes there is: IntarS. Open Source, Universal Application, several working example ERP systems available.

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In case you are okay with ASP.NET MVC C# you can have a look at the ERP Core Framework provided by Arinsys. You can download the Nuget package here. It's built over ASP.NET 5 MVC 6 framework with ports to ASP.NET 4.5+

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