| LCD_HD44780 | A library for HD44780 based LCDs. |
| MultitapKeypad | A library (driver) for matrix 4x3 or 4x4 keypad supports multi-tap and long-tap. |
| STM32F1_RTC | Allows to use the RTC functionalities of STM32F1xx based boards using external low speed oscillator. |
| TonePlayer | A library for playing melody in background process using the builtin tone() function. |