I've found the standard library to be more than capable for most CRUD style apps. You can add in simple middleware chaining using a library such as Alice (https://github.com/justinas/alice) and for passing around request contexts between them, you can use something like xhandler (https://github.com/rs/xhandler). If you want more performant or flexible routing, httprouter (https://github.com/julienschmidt/httprouter) has a nice feature set.

Maybe it's personal preference, but there's something more satisfying about the modular approach of building up an app using only components I need and understand, rather than starting with a magical feature-laden framework but quickly realizing you don't need half of what it does. I think Go aligns particularly well with this philosophy given its emphasis on composition.