For general information please refer to the blog series abap2xlsx - Generate your professional Excel spreadsheet from ABAP and the documentation. Please refer to the official wiki for the abapGit installation guide.
We use the SAP Community Network as our discussion board. You can search for all content containing abap2xlsx before you post a new question. You also can limit the search using the tag: abap2xlsx. Please use this link when you want to post a new question the tag abap2xlsx will be prefilled).
We have the channel #abap2xlsx in the SAP Mentors & Friends Slack. You can get yourself an invite here.