Free encryption plus software for linux

Nicotine-Plus is a fork of Nicotine, the Python/GTK+ 2 client for the Soulseek P2P Network. Nicotine-Pluss features include remote uploads, separate shares sent to Buddies, GUI improvements, and a tray icon.
Enhancements:
GENERAL CHANGES
- Support for Spell Checking in chat added (libsexy and python-sexy required)
- Other users Interests are now shown in the User Info tab, with expanders
- Send Message added to trayicon
- Popup Menus in Private, Chatrooms, and User Browse reorganized
- The user-entry boxes are now buddy-list combobox entries
- Users with PyGTK >= 2.10 will use the gtk.StatusIcon instead of the old trayicon.so module.
- Added a filemanager popup item to the self-browse menu; configurable under Settings->Advanced->Events
- Gstreamer-Python support for sound effects added
- Added Soulseek testing server (port 2242) to the server combobox.
- Changed the URL Catchers syntax. The ampersand "&" is no longer needed at the end of URL Handlers. The handler entry is now a combobox and includes a bunch of webbrowser commands.
- Userlist Columns are hidable and hidden status is saved.
TRANSFERS
- Added a "Group by users" check box
- Added Expand/Collapse all toggle button to transfers
- Added a popup dialog to the "Clear Queued" transfers buttons
PRIVATE CHAT
- Added gallows patch for including your username in the private chat log. (ticket #161)
- Direct private messages (currently only supported by Nicotine+ >= 1.2.7.1)
SEARCH
- Search now has combo boxes, per-room searching and per-user searching.
- Added Wishlist and changed remembered search tabs to only display when new search results arrive
- Switch to newly started search tab (ticket #157)
USERINFO
- gallows added userinfo image zooming via the scrollwheel (ticket #160)
SETTINGS
- Changed Audio Player Syntax it now uses "$" as the filename
- Exit dialog can be disabled in Settings->UI
- When a config option is detected as unset, print it in the log window.
- Move Icon theme and trayicon settings to a seperate frame
- Move sound effect and audio player settings to a seperate frame
- Reopen Settings dialog, if a setting is not set.
NETWORKING
- On Win32, hyriands multithreaded socket selector is used. This will allow a larger number of sockets to be used, thus increasing stability.
- Added Server Message 57 (User Interests)
- Send rn with userinfo description instead of just n
BUGFIXES
- Uploads to other Nicotine+ users work better
- Userinfo Description does not scroll to the bottom of the window
- Fixed a few bugs with the trayicon
- Fixed server reconnection not actually trying to reconnect (and giving up on the first try)
TRANSLATIONS
- Lithuanian translation updated
- Euskare translation updated

Encrypt This! is a Firefox extension that allows public key like encryption as well as passphrase methods.

Visit the extensions homepage to set up public and private keys or just go ahead with a passphrase of your own creation.

Using this extension you can select text and have it encrypted in one click. This will allow you to send emails more securely by ensuring that nobody other than your intended recipient can read the decrypted text.

edonkey plus is a free program peer to peer (P2P) for the peer to peer network Edonkey 2000, Overnet etc.
Basic aMule Tips
- NEVER run aMule as root.
- If you are behind a firewall or router, be sure that the ports have been opened. The default ports are 4662 (TCP). 4665 (UDP) and 4672 (UDP). If these are blocked, you will receive a "LowID" which results in fewer available sources for the files you are downloading.
- Obtain an appropriate server.met: e.g., if you are a dialup, using a large server list is not appropiate.
- Set your temp and shared directories in Preferences->Directories
- To recursively select a certain directory, right-click over it.
- You should *NOT* share
- Your temp download directory!
- Your /etc directory
- Probably not your /var, /lib, /boot, or /usr directory
- Certainly make sure that any really confidential files (password files, private SSH keys, credit card numbers :) are *not* shared. So generally do not share your entire home directory, although you might want to share some files or directories in it.
- Remember that you get certain download priveledges with those clients (aMule, eMule, etc users) to whom you upload files, in the form of reduced queue waits.
- Please note that compilation with optimizations is supported. However, if you pull a Gentoo, we will probably just tell you to recompile aMule and/or your system with sane compiler-flags before we will attempt to address the problem.

Cryptomak Cipher Tools project consists of a collection of PHP scripts for encryption purposes.
Cryptomak contains a cipher and tools for encryption utilities written in PHP, including substitution, vigenere, affine, transposition, and index of coincidence.
It is powered by the Phrame platform which implements MVC design and the Smarty template engine.
Enhancements:
- It is programmed in modular programming. Welcome to OOP world ;)
- Using Phrame as web aplication platform which implements MVC design
- Using Smarty as template engine at the view layer
- New hashing script added
- Better web design

FlexiCrypt is a universal cryptography toolkit for managing certificates and symmetric keys. FlexiCrypt can perform many kinds of encryption, decryption, signing, and several related tasks.
Main features:
- key managing (asymmetric and symmetric)
- generate certificates
- symmetric encryption
- asymmetric encryption
- hybrid encryption
- decryption
- XML-signatures
- message digest computation
- secure file deletion (wipe files)
- performance comparison

Eureka Messenger 4 software delivers secure and private messaging and unlimited file transfers over the internet.

This application no longer requires the VB Runtimes, but this new version 4 is not compatible with the previous windows version.

Installation:

Actually there is no install for this application. You can run it right where you unzipped it, or copy the files unzipped wherever you want them.

If there is a firewall on either machine, some configuration may be required in order to make a connection.

The program has a Help file to guide you on how it works, although it is simple enough to run without much assistance.

You probably need to issue a chmod +x messenger before it can run. On some linux systems you may also need to issue a chmod +755 messenger.

ChromaTabs Plus 2.2 offers you an excellent and very useful product which can make tabs more readily identifiable by tinting each tab a different color depending on the website loaded.

ChromaTabs Plus is the Firefox 3.0-3.5 compatible continuation of the original ChromaTabs 2.0 extension. By default, colors are matched to the sites favicon. Alternatively, tabs may be assigned a site-specific random color. ChromaTabs Plus is a continuation of 2.0 by Justin Dolske.