NightShift is described as 'Pre-load Netflix in advance so you can watch your favorite shows without interruption and always in full HD' and is an website. There are four alternatives to NightShift, not only websites but also apps for a variety of platforms, including Linux, Windows, Self-Hosted, Docker and Mac apps. The best NightShift alternative is nginx, which is both free and Open Source. Other great sites and apps similar to NightShift are CivetWeb, freenginx and Varnish.
nginx ("engine x") is an HTTP web server, reverse proxy, content cache, load balancer, TCP/UDP proxy server, and mail proxy server.
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CivetWeb is an easy to use, powerful, C/C++ embeddable web server with optional CGI, SSL and Lua support.
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