https://github.com/horazont/xmpp-http-upload — на Python

https://github.com/weiss/ngx_http_upload — как Nginx-модуль

https://github.com/guusdk/httpfileuploadcomponent — с проверкой файлов на вирусы

https://github.com/mathiasertl/django-xmpp-http-upload

https://github.com/toha/go-xmpp-http-upload — на Go