CarotDAV is a simple, freeware WebDAV/FTP/SFTP/ Online Storages client for Windows.

Complied Standards, Features
HTTP/1.1 (RFC2616)
HTTPS (RFC2818)
DAV class 1(RFC2518), 3(RFC4918)
Authentication Methods: None, Basic(RFC2617), Digest(RFC2617), NTLM, Kerberos, SPNEGO(Negotiate)(Kerberos、NTLM), WSSE, Passport
HTTP Proxy
Client Certificate
Compression(gzip, deflate. up to 4GiB)
FTP (RFC959)
FTPS (FTP over TLS) (RFC4217, RFC2228, RFC2246) (Explicit only)
zlib compression(IETF Draft draft-preston-ftpext-deflate-03.txt)
SFTP (SFTPv3 over SSHv2)
OneDrive
Dropbox
GoogleDrive
Box
SugarSync
Copy
Amazon CloudDrive
HubiC
OpenStack Swift
iCloud Drive
Host-specific file names(RFC1738)
support long path > MAX_PATH(260)
IMAP4rev1(RFC3501) ReadOnly
Resume
Download / Upload
Auto Split
Encrypt / Verify
Filename (AES256 CTS)
File contents (AES256 CBC)
Key and IV creation PBKDF2 (RFC2898)
Verification based on Hash (SHA-256)
Various character encodings (UTF-7/8/16/32, Shift-JIS, ISO-2022-JP, EUC-JP, Big5, EUC-KR, EUC-TW, etc)
Unicode Normalization (Unicode Standard Annex #15)
Master Password
AES256 CBC
Key and IV creation PBKDF2 (RFC2898)
SSL3.0, TLS 1.0/1.1/1.2
simplified WebDAV server for local use
GUI and CUI version

Donations are accepted on the author's homepage.