Microsoft Word and OpenOffice Writer are word processing software that provide basic functions like typing, formatting text, and checking spelling errors. They also include advanced features like mail merge, drop caps, and watermarks. 
Mail merge allows users to create multiple customized documents from a main document and a data source. Drop caps make the first letter of a paragraph larger for styling. Watermarks add overlaying text or images to documents.
Microsoft Excel and OpenOffice Calc are spreadsheet software that organize data in rows and columns and perform calculations. Advanced features include macros, lookup functions, protection of worksheets, and pivot tables. Macros automate tasks, lookup functions find values in tables, protection prevents changes, and pivot tables summarize