The best replacement for filezilla server is windows ftp.

The best alternatives to filezilla server are rated as following:
★★★★★  windows ftp
★  filezilla client

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Speaking about filezilla server, one probably shouldn't forget about sftp.

Other search terms related to filezilla server and their ratings are:
★★★★★ sftp
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filezilla server
windows ftp
filezilla client