There are 2 repositories under drop-in-replacement topic.
Drop-in replacement for ionice in 300 lines of C
Easy, drop-in solution to hook Custom Elements' disconnection lifecycle into RxJs pipelines
A drop-in replacement for vcgencmd - Python binding for Raspberry Pi's Video Core General Command Service (vcgencmd)
Now, in the drowsiness of day, that carven and delicate fane was silent, and Carter heard only the murmur of the great stream and the hum of the birds and bees as he walked onward under the enchanted sun.