Free designer checks software for linux

net-check package is a pair of simple perl scripts that will monitor and report on your internet connectivity.

The scripts came about when my DSL provider repeatedly dropped the connections on a machine that was used exclusively as a dial-up gateway.

In addition, since I am spending $50 a month for my internet connection, I want to make sure I get what I paid for.

A Sample:

To: user@isp.net
Subject: Automated Network Checks Report

Last month, there were 64.25 hours of downtime out of 720 possible hours.
(There were only 2692 out of 2880 possible samples made.)
Last months ratio was 0.089 so your bill should be $45.53.

---------------------------------------------------------

1 : 2 hr
2 : 22 hr
3 : 0.5 hr
4 : 1.25 hr
5 : 1.75 hr
6 : 0.25 hr
7 : 0.25 hr
8 : 0.25 hr
9 : 1.25 hr
10 : 3.25 hr
11 : 1.25 hr
13 : 0.25 hr
14 : 1.75 hr
15 : 0.25 hr
16 : 0.75 hr
17 : 0.75 hr
18 : 8.5 hr
19 : 0.75 hr
20 : 11.5 hr
21 : 0.75 hr
22 : 0.75 hr
23 : 1.75 hr
24 : 2 hr
25 : 0.25 hr
27 : 0.25 hr

Check Your Network Address Translator for Compatibility with Peer-to-Peer Protocols.
If you are accessing the Internet from behind a Network Address Translator (NAT) of some kind, I would appreciate your help in surveying the behavior of different NATs, in terms of how and whether they support a certain technique for enabling peer-to-peer communication between NATted hosts (particularly when both endpoints are behind NATs). Down, you can understand what NAT is.
Suppose there are three communicating hosts: A, B, and C. Host A is a "well-known" Internet server with a permanent IP address, which acts as an "introducer" for the other two nodes. (For example, Host A might be a well-known ultrapeer or a game catalog server of some kind.) Host B, using Host As "introduction" services, would like to establish a direct peer-to-peer connection with host C. Both B and C, however, are behind (probably different) network address/port translators, and neither of them has exclusive use of any public IP address.
To initiate a peer-to-peer connection with host C, host B first sends A a message requesting an "introduction" to host C. A sends B a reply message containing Cs IP address and UDP port number as reported by host C, in addition to Cs IP address and UDP port number as observed by A. (If C is behind a NAT, then these two address/port combinations will be different.) At the same time, host A sends host C a message containing Bs IP address and UDP port numbers - again, both the ones reported by B and the ones observed by A, which will be different if B is behind a NAT.
Now B and C each know that they want to initiate a connection with each other, and they know each others public (NATted) as well as original IP addresses and UDP port numbers. Both B and C now start attempting to send UDP messages directly to each other, at each of the available addresses. If B and C happen to be behind the same NAT, then they will be able to communicate with each other directly using their "originally reported" IP addresses and UDP port numbers.
In the more common case where B and C are behind different NATs, the "originally reported" addresses will be useless because they will both be private IP addresses in different addressing domains. Instead, the IP address/UDP port combinations observed by A can be used in this case to establish direct communication. Although Bs NAT will initially filter out any UDP packets arriving from Cs public (NATted) UDP port directed at Bs public port, the first UDP message B sends to C will cause Bs NAT to open up a new UDP session keyed on Cs public port, allowing future incoming traffic from C to pass through the NAT to B. Similarly, the first few messages from B to C may be filtered out by Cs NAT, but will be able to start passing through the firewall as soon as Cs first message to B causes Cs NAT to open up a new session. In this way, each NAT is tricked into thinking that its respective internal host is the "initiator" of this new session, when in fact the session is fully symmetrical and was initiated (with As help) simultaneously in each direction.
Required NAT Behavior
There is one important requirement that the NATs must satisfy in order for this technique to work: the NATs must be designed so that they assign only one (public IP address, public UDP port) pair to each (internal IP address, internal UDP port) combination, rather than allocating and assigning a new public UDP port for each new UDP session. Recall that a "session" in Internet terminology is defined by the IP addresses and port numbers of both communicating endpoints, so host Bs communication with host A is considered to be one session while host Bs communication with host C is a different session. If Bs NAT, for example, assigns one public UDP port for Bs communication with A, and then assigns B a different public UDP port for the new session B tries to open up with C, then the above technique for peer-to-peer communication will not work because Cs messages to B will be directed to the wrong UDP port.
RFC 3022 explicitly allows and suggests that NATs behave in the former, "desirable" fashion, by maintaining a single (public IP, public port) mapping for a given (internal IP, internal port) combination independent of the number of active sessions involving this mapping. This behavior is not only good for compatibility with UDP applications, but it also helps to conserve the NATs scarce pool of public port numbers. Maintaining a consistent public port mapping does not adversely affect security in any way, either, because incoming traffic can still be filtered on a per-session basis regardless of how addresses are translated. There in fact appears to be no good reason not to implement the desirable behavior in a NAT, except perhaps for the implementation simplicity of naively allocating a new public port for every new session. Unfortunately, RFC 3022 does not require NATs to implement the desirable behavior, which has led me to wonder just how many real NATs actually do, and hence this page.
What NAT Check Does
The program natcheck.c is basically just a program that "pings" a well-known UDP port at two different servers that are publically accessible on the Internet. Both of these servers run the program natserver.c, with the command-line arguments "1" and "2" respectively. In addition, there a third "conspiring" server runs natserver with the command-line argument "3". Whenever each of the first two servers receives a UDP request, it not only sends a reply directly to the sender of that request, but also sends a message to the third server, which in turn "bounces" the reply back to the original client. The effect is that the client will receive not only solicited "ping" replies from the server the request was directed to, but also "unsolicited" replies from the third server.
To determine if the network address translator in use is implementing the desirable behavior of maintaining a single (public IP address, public port) mapping for a given (client IP address, client port), the client program natcheck.c basically just initiates a sequence of simultaneous pings to the first two servers (in case some of the requests or replies are lost in transit) and checks that the clients address and UDP port as reported by both servers is the same. If the NAT naively allocates a new public port for each new session, then the source port as reported by the two servers will be different, and its time to upgrade your NAT.
The replies echoed from the third server are used only to check whether the NAT properly filters out unsolicited incoming traffic on a per-session basis. Since the client never sends any messages to the third server, if the NAT is properly implementing firewall functionality, the client should never see the third servers echoed replies even after opening up active communication sessions with the first two servers.
Enhancements:
- The NAT Check client no longer attempts to guess whether you have Basic NAT or Network Address/Port Translation (NAPT). It turns to be quite difficult to test for this property reliably, because many NAPTs attempt to bind a private UDP port to a public port with the same port number if that port number is available, causing NAT Check to falsely report Basic NAT. The only way to test for this property reliably would be to run NAT Check on at least two client machines simultaneously, and since this property isnt terribly important to P2P apps its just not worth the trouble.
- The NAT Check client now tests for one additional NAT feature, which I call loopback translation. If a NAT supports loopback translation, it means that a host on the private network behind the NAT can communicate with other hosts on the same private network using public (translated) port bindings assigned by the NAT. Most NATs probably do not support this feature yet, but it may become increasingly important in the future where P2P clients may be located behind a common ISP-deployed NAT as well as individual home NATs. More details on loopback translation will appear in the next version of my Internet-Draft, to be released soon.
- The NAT Check client program now has a command-line option, "-v", which turns on verbose messages during the test.

Crow is a modern GUI builder for the GTK+ toolkit.
Crow is full-featured yet lightweight: its tree-based [Property Explorer]? solves many GUI constructing tasks in a versatile manner without additional popup dialogs. The project is targeted to develop a tool that is coherent and productive for experienced GTK+ users as well as simple and accessible for newcomers.
Main features:
- [Property Explorer]? for managing trees of nested objects and arrays
- undo/redo for all operations
- uses GuiXml as a save format: a simple GUI description language
- utilizes GtkUIManager for generating menus and toolbars
- multi-platform: GNU/Linux, *BSD and Windows are supported
- IDE-embeddable: implemented as a widget in a dynamic library
- standalone designer application is included in the distribution
- GPL license

ssl-cert-check is a Bourne shell script that checks the expiration status of digital certificates on SSL servers.
It supports both interactive and batch modes and easily integrates with cron. It provides custom expiration thresholds and can be configured to send email if a certificate is close to expiring.
Enhancements:
- This release contains a new "-i" option to print the certificate issuer.
- The requirement to use GNU date has been removed (the program now uses a built-in Julian date routine).
- The documentation has also been significantly updated to include numerous useful examples.

Quill is a visual Web interface designer based on QuiX, Porcupines integrated XML User interface Language.

It took us quite longer than we expected but here it is. Quill is a visual web interface designer based on QuiX, Porcupines integrated XML User-Interface Language. We believe this is a major leap for the web interface design process, as it has become almost identical to this of a common desktop application.

This is an alpha release and as such there are a lot of missing features, but generally you can get things done a lot faster and easier than before. This release supports almost every QuiX widget, giving you full control over it, exhibiting all of its editable properties.

fs-check program checks filesystem sizes to see if they are getting too full. It uses a configuration file that specifies the filesystems to check, email contacts, trigger thresholds (percentage or amount used/unused), and a report program to run.
Also included in the package is such a sample report program, fs-report. It shows things like the largest files, the newest files, and core files. It can be run from cron or as a daemon.
Both programs have a number of command-line options.
Enhancements:
- Various bugs have been fixed.
- This package will now build outside of the source tree.
- An option for specifying the default configuration file was added.
- Perl 5.006 or greater is now required.

RTL-check is a framework for static analysis of programs from a safety and security perspective.
RTL-check project performs analysis on RTL, which is the low-level intermediate representation generated by GCC.
Enhancements:
- The performance of the analysis was improved, and a minor bug was fixed.