Optiboot is an easy to install upgrade to the Arduino bootloader within Arduino boards. It provides the following features: Allows larger sketches. Optiboot is only 512 bytes, freeing 1.5k of extra ...

The STM32duino bootloader, is an experimental bootloader, based on the Maple bootloader (developed by LeafLabs), however it also works with most (but not all) "Generic" STM32 boards. Credit also goes ...