- Objective-C (supported by gcc)
- F# (supported by Mono)
1 year later
9 months later
The Python problem has been discussed many times. 2.5 is a lot faster than 2.6. And most likely also faster than 2.7. That is why I rather prefer to stick to 2.5.
Instead it could make sense to upgrade the 3.x branch from time to time to see how Python 3.x develops.
I see the point in keeping 2.5 around, but it would be nice to be able to use to the newer additions in the 2.x branch as well. Isn't it possible to have both 2.5 and 2.7 available?
Technically possibly easy. But the value you gain from that is pretty low. Python 2.5 is good enough. If you dont think so I rather recommend to use 3.x.
4 months later
I have seen that Javascript (spidermonkey) is available on ideone. Can this be added or better replace the rhino which is obviously not very popular here.
2 months later
Clojure is developing rapidly, so version 1.1 feels positively ancient nowadays. Upgrading to 1.3 would be really nice.
2 months later
I'd also like to see Objective-C... and I'd like to see it badly enough that I'll gladly volunteer to write any extensions to the online judge that are necessary to enable it. Yes, one often gets just what one pays for with free coding help, but I'm the exception, I swear! 
Admittedly, I've recently been doing only mobile and web development, but I have past experience in writing and integrating test harnesses, which I suspect is not dissimilar to the process of writing a judge.
Can anyone comment on whether there are plans underway to add Obj-C support?
(As an aside: I posted a thread in FAQ before finding this one. My apologies for my newbish error... if anyone with admin rights has a way to move that thread to this forum, please feel free to do so.)
3 months later
Racket ( racket-lang.org ) would be a good addition. I believe it's now one of the more popular Scheme variants.
Standard ML is notably missing altogether. I believe the main players are MLton, SML/NJ, and MLKit. As for Schemes, I mentioned Racket, but it would be nice to add Larceny Scheme, a high-performance option.
10 days later
1 year later
Oh, this is the place to complain about language version!
Please consider upgrading to version 2 of D language. D1 is deprecated and almost nobody is using it.
dlang.org/changelog.html
9 months later
21 days later
Please add pypy (pypy.org/).
It can replace the loss of psyco for Python users.
Please update fpc to 2.6.4 (freepascal.org/)
2 months later
How about upgrade Haskell to Haskell Platform 2014.2?
More details can be found https://www.spoj.com/forum/viewtopic.php?f=53&t=11555&sid=da4d69a531c4228b251c62699d1d96e23.
10 months later
15 days later
Currently SPOJ only has GHC, nowadays people choose Haskell Platform instead of GHC, Haskell Platform basically has GHC and several import libraries, including Vector, unordered-containers. you can think bare GHC (without haskell platform) of C++ without STL, it's very painful.
I enjoyed solving SPOJ problems with Haskell, even it's much more difficult than C++ due to the strict time limit; in fact the coolest feature of SPOJ to me is it has a haskell compiler. And I believe more and more people will enjoy FP.