Addition of "Nanjing Qinheng Microelectronics" CH32V30x series microcontrollers
Nanjing Qinheng Microelectronics official english site
CH32V303, but CH32V307 and CH32V305 have same page on the official site.
This is connectivity MCU's series with RISC-V core from chinese company "Nanjing Qinheng Microelectronics". Series 303, 305 and 307 in the same packages have the same order and pin names.
CH32V305 and CH32V307 products
Here is CH32V303/305/307 datasheet CH32V307DS0.PDF