Free transmission software for linux

Cutlass is a cross-platform system for secure peer to peer communication, oriented towards small groups. It provides IM and file transfer. A major design goal is to be easy to use, even by non-security conscious users. The Cutlass main goals are :

Easy enough to use for broad adoption
Coded using widely supported APIs, to be multiplatform
Secure by default, using encrypted channels
Useful for everyday Internet functionality. Transmit sound, files, text.
P2P as independent of central servers/failure points as possible.
Extendable (both in functionality and paranoia)
Not dependent on central servers

Cutlass is currently under development. The current version provides message, file and voice transmission, but grouping, directory services and connection forwarding are not yet implemented.

Cutlass was originally named DEFJAM (Distributed, Encrypted File Journalling And Messaging), and was the subject of a presentation at Notacon.

TuxGuardian is an application-based firewall. TuxGuardian was developed after the observation that Linux security applications were not tailored for lay users. With TuxGuardian youll be able to implement access control policies to the network resources in order to identify and control every application that tries to access the network.
All this means that now you can make your machine secure by controlling and forbidding transmission and reception of data by unauthorized applications.
TuxGuardian makes use of the latest security mechanisms included in the Linux kernel 2.6, such as the LSM framework, and is really simple to use (thats the intention!).
TuxGuardian is free software distributed under the GNU GPL, which means that you can help too!.
TuxGuardian can be used in the next situations:
If you want to protect you computer against spywares, trojans and other evil pieces of software;
If you want to have an additional layer of protection working on a per-application basis,
besides a packet-filtering firewall or other low level security mechanisms;
If you want to stop backdoors and rootkits which modify the expected behavior of your applications from accessing the network;
If you want to implement the internal security of your network (this is specially useful since ordinary firewalls usually only take care of external threats);
If you want to implement an extra security layer in your network, in addition to the one provided by institutional firewalls and gateways;
Main features:
- Detects unauthorized applications trying to act like a client or a server;
- Operates with or without user intervention;
- Verifies the applications integrity so that maliciously modified software wont be able to send or receive data through the network;
- Uses a three-layered architecture of independent modules, which eases the task of addings new features and functionality;

Trustix Enterprise Firewall represents a revolution within firewall management software. Trustix Enterprise Firewall is the worlds first WYSIWYG Enterprise Firewall, making it easy-to-use and easy-to-deploy. By utilizing the WYSIWYG GUI, your Enterprise Firewall will be out of the box and implemented in an unbeatable 25 minutes- and without the need for a dedicated systems administrator!
A fully-featured packet-filtering router, Trustix Enterprise Firewall has advanced capabilities including an intuitive graphical user interface (GUI) for visualizing and editing firewall policy.
This unique GUI enables you to manage traffic for all your zones (up to 24) as well as port forwarding, network address translation (NAT) and virtual private network (VPN) configurations.
Packet-filtering enables Enterprise Firewall to act as a router to accelerate data transmission. Meaning no more bottle necks due to time consuming proxies.
IP-address sharing by masquerading or NAT.
The underlying rules generated by the program are then fully optimized before being deployed- thereby optimizing the security and performance of your firewalls architecture, and avoiding errors and duplications.
Trustix Enterprise Firewall uses the IPsec protocol to encrypt data transmitted over the net- extending the security of your network to all arms of your business. Communications between your office and home users are protected using 168-bit 3DES encryption- triple the encryption, triple the security! Enables remote, secure configuration of multiple firewalls from one Windows or Linux desktop.
Trustix Enterprise Firewall Blockades and repel malicious attacks from hackers, Trojans, worms and infected files.
Main features:
- Visualise DMZs - drag and drop security policy deployment
- Integrate branch offices with 3DES encrypted VPN tunnels
- Accelerate internet access times with proxy caching server
- Authenticate remote workers with PKI X.509 certificates
- Ensure high availability with fault tolerant automatic failover

The goal of tidydoc is to make documentation organization easier. You can add documents to a pool of documents, give them the right names and put them into the right directories, and generate a set of HTML pages to browse your documents.
A bibtex file can also be generated. It is written in Python in the spirit of flexibility and easy tweaking, but with default behaviors that fit the needs of most people. You can add documents using most transmission protocols, such as a simple cp or through SSH with SCP.
Tidydoc then generates HTML or bibtex files indexing your documents. A simple XML file is required for each document, including some information. These description files may be generated by using tidydocs upload facilities, but this is not mandatory.
Main features:
- Add documents to a pool of documents.
- Give them the right names and put them into the right directories.
- Generate a set of HTML pages to browse your documents.
- Generate a bibtex file listing indexing each document.
Enhancements:
- Support document reorganization a posteriori.
- Bibtex support.
- Easier installation.

Draco GNU/Linux is a Linux distribution based on Slackware 11.0 and featuring packages from pkgsrc 2007Q1.
Main features:
- Kernel 2.6.19
- Glibc 2.3.6
- GCC 3.4.6
- X.org 7.2
- XFCE 4.4.1
- GNOME 2.16.3
- KDE 3.5.6
And many more (678 precompiled packages available and over 8000 from source).
It also contains the following applications:
- Slim
- Firefox
- MPlayer
- Thunderbird
- Gaim
- XChat
- Liferea
- Transmission
- GIMP
- Inkscape
- GQview
- Abiword
- Gnumeric
- Bluefish
- Audacious
- GXine
- Graveman
- SeaMonkey
- Epiphany
- Evolution
- Rhythmbox
- Totem
- KTorrent
- KOffice
- Amarok
- Kaffeine

Verona is a portable VOIP toolkit based on oRTP, oSIP, eXosip, curl, and ffmpeg.
The toolkit includes a phApi module, which is a high level VOIP API that allows a developer to create voice/video over IP applications in a dozen lines of code.
It includes an example of a minimalistic SIP user agent that supports audio and video transmission. The toolkit is basically the VOIP engine used by the openwengo project.
Enhancements:
- This release optimizes and simplifies the build system.
- It adds support to cross-compile for ARM Linux.
- It adds support for transmission of DTMF in the SIP INFO packet.
- It is compatible with the latest version of Intels IPP.

TCPreen is a simple tool to monitor and analyze data transmitted between clients and servers through connection-oriented streams data such as a TCP sessions; it supports TCP over either IPv4 or IPv6. This tool focuses on the data stream (software/socket layer), not on the lower level transmission protocol as packet sniffers do.
TCPreen listens on a TCP port and wait for incoming connections to come in. Then, it forwards data sent by the connecting client to another server port (possibly on another computer) and forwards server responses back to the client.
TCPreen can display data on your console in real-time and/or save it to log files for later reference.There are various display formats.
While it was originally meant to help developers reverse-engineer TCP-based protocols, it can also be very useful to debug network server or client software or for a system administrator to monitor a TCP service.
Enhancements:
- libsolve/getaddrinfo.{c,h}, src/winstub.{c,h}:
- dirty kludge to resolve getaddrinfo & co at run-time
- so that tcpreen can still run on Windows 2000 and older.