I have near full catalogue of Dewalt cordless tools and most of stationary wood working tools to show off my woodworking fanaticism. Among them, oscillating multitool and angle grinder are the most used tools in my tool box and I have couple sets of them to prove it. Multitool is great on cutting out damaged parts , scraping hardened caulk or gums as well as chiseling out holes or cuts. I use cheap Amazon replacement blades because most of time I ruined blade by hitting the nails or concretes than normal wear.
4″ cordless grinder is tool made in heaven in my mind. I use metal cutting blade to cut any metal objects and diamond grinding wheels to grind off high or rough spots on concretes or blocks. Diamond blade are great for cutting tiles, bricks and concretes. Sanding discs are great for fixing jammed doors or sharpening mower blades or knifes. Wire brush attachments are great for rust removal. I use Menards’ cheap metal cutting discs. Diamond wheels are from ebay or amazon to save few bucks.