WBestCrypt
WBitLocker
WBitmessage
WBitwarden
WConfide
WCryptocat
WCrypTool
WCSipSimple
WDiskCryptor
WEJBCA
WEnigmail
WFreeOTFE
WGNU Privacy Guard
WGnuTLS
WGPG Mail
WGuardian Project (software)
WJava Anon Proxy
WKeePass
WKeeWeb
WLibreSSL
WMailfence
WMailvelope
WMicrosoft SEAL
WMitro
WNext-Generation Secure Computing Base
WOpenBSD
WOpenKeychain
WOpenPuff
WOpenSSH
WPALISADE (software)
WEverykey
WPassword Safe
WPhoner
WPhoner
WPleasant Password Server
WPretty Easy privacy
WPrivate Disk
WProtonMail
WPublic-key cryptography
WPuTTY
WRclone
WRetroshare
WSecMsg
WSecureCRT
WSignal (software)
WSteganography tools
WSyndie
WSyskey
WTamarin Prover
WThreema
WTinfoil Hat Linux
WTor (anonymity network)
WTrueCrypt
WTrusted Platform Module
WTwinkle (software)
WVeraCrypt
WWinPT
WWinSCP