In latest release (v2.6.3)

Fix sync frequency getting reset
Fix for port getting reset when asking for password
Remove reference to powerpacks library
Translated to Indonesian
Updated German, Danish and Simplified Chinese translations

Version 2.6

One-way synchronization
Small tray form with recent files, transfer progress, sync status
Made prefix of temporary file names configurable
Context menu is now optional
Translated to Arabic, Bulgarian, Indonesian
Fixed scaling issues
Fixed crash when uploading used/locked files
Updated French, Spanish, Portuguese, Danish, Dutch, Swedish, German and Simplified Chinese translations

Version 2.5

Support for public key authentication
Keep connection alive
Translated to Basque
Sync Improvements
Various UI and UX improvements

Version 2.4

Certificate support (accept/decline, save trusted ones locally).
Select paths outside of user's home path
Transfer progress status.
Improved debugging system.
Translated to Hebrew, Serbian.
Improved listing, now works on folders that contain spaces.
right-to-left language support
Fixed: Recheck used files
(massive) code clean-up

Version 2.3

File filters: select what folders/file extensions to sync
support for multiple profiles
ask for password support (optional)
Translated to Czech.
Fixed: changed the version-checking system.
switched to json config files, using JSON.NET
using DotNetZip to extract the WebUI files
Changed FTPbox-generated temp file format and filtered them out of sync
The WebUI files are downloaded, extracted and uploaded from the %AppData% folder
Debug.html now saved in %AppData%

Version 2.2

Added Context Menus for the local files/folders
Added special character support
Added a nice translate form to make translating FTPbox as simple as possible.
Use of temporary files when uploading/downloading to avoid file corruption.
The web interface gets updated automatically
Files are only uploaded after they're not being used to prevent corruption of big files (not finished).
More FTPS Security Protocols checked ( auto-detected )
More detailed error logging.
Running with -nomenus parameter will not put the required keys in the registry.
Translated to Slovak, Galician, Portuguese, Thai and Slovenian
Fixed: On SFTP, GetComPath would corrupt the path if SFTPHome is null
Fixed: In SetTray, the program shortens the tray text if it's longer than 64 chars
Files/Folders are reqycled instead of being permanently deleted.<
Deleted items are removed from the recent list.

Version 2.1

Optional: manual or automatic remote-to-local syncing to control bandwidth usage.
Speed Limits ( set maximum download/upload speed, FTP only )
New SFTP library (SSH.NET)
Better file filtering to avoid syncing temporary files, server files etc
On startup, the program will wait for an internet connection.
On startup, the program checks for missing resources (dll files etc)
Translated to Hungarian, Norwegian, Vietnamese, Japanese, Lithuanian, Traditional/Simplified Chinese, Danish, Polish and Croatian
Fixed: Much faster user interface (forms, tray menus etc)
Fixed: changed the syncing method to be more reliable and stable
Fixed: Improved handling in syncing multiple files
Fixed: More detailed tray notifications and tray tooltip.
Fixed: Removed the second (background) connection
Fixed: Program doesn't (need to) check for remote server's time.
Fixed: updater.exe is run as administrator to not throw an error regarding permissions.

Version 1.8

FTPS Support (both implicit and explicit)
New Log class (generates an html debug log when run with the -debug paremeter)
New FTP library
Option to open local file/folder when tray notification/recent item is clicked.<
Translated to Greek, Italian, Brazilian Portuguese, Turkish, Faroese, Russian, Swedish, Korean, Albanian and Romanian
Fixed: translated the tray menu
Fixed: 'change FTP account' / 'change paths' buttons not working properly
Fixed: changed to a more practical translation-handling system
Fixed: getting home path of SFTP accounts
Fixed: accessibility by screen readers
Fixed: Settings.xml is now saved in the AppData folder
Removed timer for checking internet connection, replaced with NetworkChange.NetworkAddressChanged
Fixed: double-clicking the tray icon opens the local FTPbox folder

Version 1.7

Web Interface
SFTP Support
SFTP port optional
Encryption for account info in XML
Changed from portable to setup
Translated to French and Dutch
Fixed: deleting folders that contain files
Fixed: tray messages not always showing properly
Fixed: Expanding/Collapsing list items in "Select Paths" form

Version 1.6

New (awesome) icons
Translated to Spannish and German
Fixed: Subdirectories not syncing
Fixed: Offline Mode<
Fixed: not letting windows shut down
Fixed: not opening on windows startup
Fixed: start-up error with creating directory on root folder

Version 1.5 and earlier

Synchronizing root folder with FTP.
Getting links to files
Starting on windows start-up
Notifications (optional)
Tray menu
Recent Files
Fixed: Forms not closing properly