The free version of Generate Blocks provides access to custom fields created with ACF. It also includes an advanced Query Loop Block. Paired with the pro version of the GeneratePress theme and you have a complete theme builder solution.
GeneratePress is one of the most popular WordPress themes. GenerateBlocks can be used with any theme, but pairs naturally with the GeneratePress theme. The pro version of GenerateBlocks includes the ability to create local block patterns. There is a lifetime option for the theme, but not for the blocks.