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Are there any open source projects out there that are written in a functional programming language and that people can contribute on? I am trying to increase my area of expertise to a functional programming language and I think contributing to a project might be the way to go. Maybe some OCaml or Lisp projects?
MLdonkey is written in OCaml.
Of course various libraries for functional languages are also generally written in the respective language. So you can find a lot of projects on the language's "library hub". For example for haskell there's hackage, which is full of open source haskell projects.
SourceForge's projects written on:
OCaml (187)
Lisp (436)
Common Lisp (111)
Erlang (110)
http://github.com/languages/OCaml
http://github.com/languages/Common%20Lisp
http://github.com/languages/Erlang
A few of the popular NoSQL databases are written in Erlang (if you consider that to be a functional language, that is), including CouchDB and Riak. Both are open-source, and both still under active development.
Most of EMACS is written in elisp.
Ejabberd written by Erlang seems to be a chat server that is mature and active.(as #skaffman said, if you consider Erlang as a functional programming language).
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I'm looking for a code duplication tool that is language agnostic. It's easy to find language specific code duplication tools (for Java, C, PHP, ...), but I'd like to run some code duplication analysis on a templates in a custom syntax.
I don't care about advanced parsing of the syntax, just straight line based raw string comparison is fine. Whitespace insensitive matching would be a plus, but not required. (It's not that hard to normalize/eliminate whitespace myself.)
Does anybody know a tool that can be (mis)used for something like this?
Have a look Simian, you can use it for Java, C#, C, C++, COBOL, Ruby, JSP, ASP, HTML, XML, Visual Basic, Groovy source code and even plain text files.
Also, a similar question here.
You can also take a look at Sonar http://www.sonarsource.org/
Take a look at this one https://siderlabs.com/
At this moment it support C, C++, Cuda and others Python, PHP, Java, Javascript coming soon
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I think it would be valuable to have a list of all the programming languages that have a significant open source component (i.e. I can do a significant amount of work in it without using any non-free components) and that are cross platform (i.e. that will run on all the major platforms: Windows, Mac OS X, and Linux/BSD), along with information about how they are useful. That way, one could pick out the ideal language for a particular project if a choice is available.
Therefore, it would be great if you could list all the languages you know, include at least a bit about the merit/usefulness of each, and maybe some interesting points (like a good IDE, important software libraries, etc).
Links are good too (link to the developer's site or to a major resource site).
This would be a good complement to the list of programming books (https://stackoverflow.com/q/194812/289380).
EDIT: Oh, and no flame wars :).
EDIT 2: I have set up a Wiki to hold this list and a list of the programming books linked to above: http://programref.wikia.com/
Python: http://www.python.org
Fast to develop in, huge standard library, lots of support, great interpreter, great scripting language.
Perl: Do I really need to say more?
Ruby: http://www.ruby-lang.org
Another great scripting language, very powerful, OO to the core but still pragmatic. Very popular right now, with lots of addon libraries.
Lua: http://www.lua.org
A small,fast scripting language designed to be embedded in other applications. Small standard library with a reasonable set of basic stuff and additional libraries / C extensions to do other stuff. Very popular in games - the World of Warcraft client UI is built and extended in Lua.
Language: Java (OpenJDK) - http://openjdk.java.net/
IDE: Eclipse, Netbeans
C++: The quinessential OOP programming language. Massive number of libraries to do just about whatever you could imagine. Some IDE's include Code::Blocks, Dev-C++, Netbeans, and Eclipse.
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I have searched the internet for drivers to connect to either database and all the projects I have seen have either been dead for a long time, look incomplete, or don't have good enough documentation to be usable without reading all the source.
Has anyone used Erlang to talk to either MySQL or PostgreSQL before and what sort of package did you use to do this?
Will Glozer wrote a nice native PostgreSQL client:
http://github.com/wg/epgsql
Yariv's mysql driver seems to be the best available: http://code.google.com/p/erlang-mysql-driver/
http://yarivsblog.com/articles/2006/09/13/erlang-mysql-driver-reloaded/
I haven't personally used it as my erlang projects mostly talk to redis, but my quick scan of the source didn't reveal anything too terrifying.
Maturity is a relative thing, especially for more esoteric languages like erlang.
Erlang pgsql - The pgsql-driver is a 100% erlang implementation of the Postgres Frontend/Backend protocol.
Plain straight ODBC ? Quite simple to set it up, but a pain to make it work..
http://github.com/inaka/sumo_db_mysql or http://github.com/inaka/sumo_db_pgsql Both of them are stable, actively maintained and used in production systems
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Are there any cross-platform (only interested in Windows and OS X) IMAP libraries which I can use from C++? Preferably open source as well.
I am currently using the IMAP library from Chilkat, but this is Windows only.
I've found libEtPan and VMime and just wondered if there were any others I could look at to compare.
Another good choice can be cURL library which is C library but it has C++ bindings - cURLpp.
The best thing is that it is licensed under the MIT license which perfectly fits for the commercial use or a non-opensource projects.
What about VMIME?
It has all my favorite things in a library:
Free, as in free beer
Free, as in free speech (Open Source also)
Regularly updated (very important)
Decent (though not great) documentation
Portable
Other alternatives are libetpan (a C language library) and Mailcore (a C++ wrapper for libetpan)
Although a bit dated since it's development has stopped being open-source, you can check the UW-IMAP toolkit. However, its primary author continues development of the toolkit under the name Panda-IMAP and makes it available to anyone who wishes to donate for the development of the project.
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Is there a free (preferably public-domain or BSD-like license, but GPL will do) implementation of a multi-layer perceptron anywhere on the net?
I have textbook examples but the licenses are too restrictive, and although I can just about follow the math in the Wikipedia articles I'm not confident enough of getting it right and it's hard to test.
I've done a quick google search and found some free (as in beer) binary-only versions. I'm hoping to find an MLP which is part of a larger open-source project.
FANN (Fast Artifical Neural Network Library) is a great general-purpose neural-network library written in C but has bindings for just about any language you might want (C++, .NET, Python, Mathematica among others). Even better, it's open-source and licensed under the LGPL, so I'd imagine that would be fine for you.
Neuron.NET is another good alternative if you're using .NET (also open-source), though it's licensed under the GPL.
Hope that helps.
WEKA includes a multi-layer perceptron implementation. I haven't examined the source code myself but its GPL I believe.
OpenCV has a Feedforward neural network implementation.
Have a look at http://neuralensemble.org/trac/PyNN! It is a unified layer to a lot of different free simulators such as BRIAN, NEST, NEURON, etc.