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We are currently using a free trail version of KEP Server for our OPC to communicate with our PLC. We were wondering if anyone knows of any good open source OPC software.
Some vendors offer OPC servers for free with their PLCs, but I haven't seen any free OPC servers that supports multiple vendors like KepWare OPC server does. Neither free (unless you count time limited ones), neither open source ones. That saying, the best bet you can get is to get Delphi and make your own OPC servers and clients with free sources found here. I am not aware of free OPC server sources for other languages.
If you don't mind skipping the OPC server and communicating directly with the PLC you should have a look at libnodave.
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I am trying to implement a client side software (a messenger) in java that uses XMPP and supports videoconferencing. For this goal I've downloaded smack and tried to work with it, so I need an xmpp java server that is open source and supports videoconferencing. Then I could connect my database to this server and use it.
Is there any server as I need?
You want XMPP with MultiMedia Jingle. But the Jingle implementation in smack is pretty old, you have to find out if it works for you. Also I think that Jingle currently only supports one-to-one video-chat, there is a multiparty Jingle XEP but it's deferred. The good news is that it's relatively server independent, all logic and negotiation is done on the client side.
If you are looking for a Java XMPP Server, give Openfire a try. Openfire is also open-source. But you don't need an Java XMPP Server just because Smack is written in java. There are many alternatives.
You are basically asking for some sophisticated solution for free/as open-source. But AFAIK no one has taken the effort to built something like that (yet). If you have the manpower, time and knowledge, you are sure welcome to contribute to the community. :)
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I am writing a database application in C linux. Currently I work on mysql but later we might migrate to postgres. Therefore my boss has asked my to prepare the application to be able to use either of the databases(mysql or postgres).
Is there a free api which I can use for this purpose? Or any suggestion on how best I can do this?
The official answer to that is ODBC.
If you don't like that (and let's face it, no one really does), Qt has a database access module, QtSql. Obviously, this will require you to make heavy use of Qt in your application.
If you can find drivers for your platform, ODBC was supposedly meant to provide exactly this: a platform-independent way to talk to databases.
(I say supposedly because in my experience, ODBC is such a mess that hooking up to an ODBC driver once turned out to be more difficult than just writing the code three times for three different databases.)
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I have set up an ubuntu-eucalyptus cloud. I just want to know what are the open-source/enterprise tools available (if any) to manage these clouds. For example, how can I monitor the instances in my cloud ? How can i track usage per user/group and bill users accordingly ? how can I create backup of instances etc.
I have searched on the internet but cant find a satisfying article. Please guide .
management tools I know about for UEC would be
Elastic Fox: https://help.ubuntu.com/community/UEC/ElasticFox
and a hosted commercial tool from canonical https://landscape.canonical.com/ plus things that talk EC2 api like scalr or rightscale should work
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I always used to use Dreamweaver for web work, but now I work in Emacs, with Filezilla for non-text file uploads. What I miss from Dreamweaver is the easy synchronisation feature in its file manager. Is there any simple opensource software that would fill this gap for me?
I prefer WinSCP as an FTP/SFTP/SCP client, and it's one of the few clients I've seen that supports synchonised browsing similar to Dreamweaver. SmartFTP is another one that does this, but it's not free.
See http://winscp.net/eng/docs/task_navigate#synchronize_browsing
Aptana does that and it's opensource; however, sftp support is not free. I would say it is the one of the better alternatives to webdesign. Give it a try, I've been hooked
Another plus feature is the integration of jquery, python, php, and svn. The pro version includes sftp support and cloud hosting, and i think it's around $100
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I am in the process of trying to graphically represent all of our server racks. So when we receive a new server we can decide where this should be put and where a specific servers currently resides.
Are there any existing software packages that stores this kind of data already? I'd prefer open source ones if there are any but anything would be helpful.
If you use nagios as monitoring application you could use NagVis to create custom status maps e.g. a rackview of your servers.
Example Screenshot
RackMonkey seems to fit your requirements too.
I had a look around at this and the solutions suggested (thanks Node) and at the moment my feeling are using one of the following:
NVentory though I'm not sure my company will want to use ruby and rails as this would be our first product using this
Rackview
Or more likely just MS Office Visio 2007 Add-in for Rack Server Virtualization however this looks like it only links to excel and hopefully I can use excel to query a database.
I will update when I have played about with these tools and see what they can provide.