xreef/SimpleFTPServer

SimpleFTPServer is a standard utility library for the IoT ecosystem. With 174 stars and 47 forks over five years, it has established itself as a reliable choice for developers needing basic file access on microcontrollers like the ESP32 or Raspberry Pi Pico W. Its primary value proposition is its cross-platform abstraction, handling the nuances of different WiFi and Filesystem libraries (SPIFFS vs. LittleFS vs. SD) across various architectures. However, it lacks a moat. FTP is an aging, insecure protocol that is increasingly being replaced in IoT contexts by WebDAV or specialized OTA (Over-The-Air) update frameworks like ElegantOTA or ArduinoCloud. The project has zero current velocity, suggesting it is in maintenance mode or functionally complete. While it won't be displaced by frontier AI labs (who have no interest in low-level IoT file transfer), it faces displacement from modern security requirements (TLS/SFTP) and first-party toolkits from hardware vendors like Espressif and Arduino that provide integrated cloud-syncing features.