STMicroelectronics has done a good job of creating example projects for their STM32 devices. A great job, in fact. At least if you ask me. There are well over 4000 different STM32 example projects to be downloaded from the STM32Cube page, which is a whole lot. Many of these are nontrivial, using feature-rich middleware too. I think it is safe to say they are a popular starting point for many new STM32 designs.
All of these example projects have not been ported to the Atollic TrueSTUDIO IDE, unfortunately. But thanks to the project importer, TrueSTUDIO can import almost all of these example projects automatically. Learn how in this blog post!