ABAP Central Information, help, source code, tutorials http://www.scott.net/~solomon/

ABAP Hints and Tips For ABAP/4 programmers to find hints and tips on programming with SAP's ABAP, useful function modules, and source code. http://abap4.tripod.com/

The SapFaq Email-based peer-to-peer technical support from experienced professionals. Home of the original MIT-sponsored SAP-R3-L Technical Support Forum. Free to qualified professionals. [Membership required] http://www.SapFaq.com

CT-Software Searchable ABAP Freeware Pool http://www.ct-software.com/reportpool_frame.htm

SAPEdit External ABAP/4 editor for SAP. Download, order online. http://www.sapedit.com

SapPoint Documents and screencams on topics of ABAP/4 programming http://www.sappoint.com

SAP Development Provides ABAP source code and information on SAP's technologies. http://www.sapdevelopment.co.uk

SAP-EDI.com EDI/ALE answers in plain English. http://www.sap-edi.com/

iViewStudio Proposes predefined content modules and information on portal technology and integration. http://www.iviewstudio.com/

OR Soft Presents a tool for mass changes to master data in flat tables. In Merseburg, Germany. http://www.sapmasterdata.net