1. Visit https://www.indezine.com. It is a great place to learn how to make better PowerPoint presentations with tutorials, articles and reviews.
2. Visit www.fastlaneppt.com. It is a very accessible PowerPoint add-in that boosts productivity and quality of output.
3. Visit www.add-ins.com. It has Microsoft Excel add-ins that make Excel easier to use.
4. Visit www.wordaddins.com. You'll find Word add-ins that help you work more efficiently in Word.
5. Soft14.com - get free, shareware and quality commercial software about Business and Finance Miscellaneous and all-in-one