Update with great feedback from the above posts
//---Mac-specific---//
//Mac Comments, Finder Windows Size, Tags, ...
(?d).DS_Store
.DocumentRevisions-V100
//Mac Folder Icons, which will not sync to Windows
(?d)Icon*
.Spotlight-V100
.TemporaryItems
.Trashes
.fseventsd
//Mac Flag to enable translation of Folder Names
(?d).localized
//Mac Temporary iCloud files while synching
.iCloud
//Mac OS Metadata on Windows or Linux filesystems
(?d)._*
//---Windows-Specific---//
(?d)desktop.ini
(?d)Thumbs.db
(?d)$RECYCLE.BIN
//---Linux-specific---//
.Trash-*
//---QNAP-specific---//
(?d).@__thumb
(?d).AppleDB
//---Synology-specific---//
(?d)@eaDir
//---Application-specific---//
//-Syncthing
(?d).stignore
(?d).stfolder
//-vi(m)
(?d)*.*.sw[a-p] # Thankys to Tom Hale!
//-Dropbox
.dropbox
.dropbox.attr
//-Microsoft Office temporary files/lock files
(?d)~*
//-KDE
.directory
//---OTHER---//
Microsoft-Benutzerdaten
Notizbuch von Wolf.url
Outlook-Dateien
RDC Connections
.parallels-vm-directory
Default.rdp