Open Source and Linux friendly (for rigs)
Regarding speed I don't known yet.

I have worked on CryptoNight ATI sgminer based on sph-sgminer.

I have already lost more then one week for this full-time job   , but currently I don't have time for this project.  

Here is repo: https://github.com/Atrides/sgminer-monero

What is done: all, except of right cryptonight.cl

Miner works currently via RPCv1, available on test-port 8001 on erebor.dwarfpool.com
I have integrated wolf's cpu-miner to compare hash, so, debuggers can see it in logs as "DIFFERENT_HASH" if OpenCL gives wrong hash.

In "cryptonight.cl_withaes_noworking" I have added AES implementation from djm. But with some errors.
"cryptonight.cl" == "cryptonight.cl_withkeccak_noaes" does not have AES therefore bad hashes.

So, if anybody can check and make normal "cryptonight.cl", you can use test port 8001.

Due to very high transaction's fee that pool pays from own funds, we have changed rules for autopayouts to exchange:
- once an hour if balance >5 XMR
- once a day if balance >1 XMR

For users with normal wallet no changes:
- once an hour from 0.1 XMR

See my repo, may be you have more luck:
https://bitcointalk.org/index.php?topic=656841.msg8117523#msg8117523

I have worked on CryptoNight ATI sgminer based on sph-sgminer.

I have already lost more then one week for this full-time job   , but currently I don't have time for this project.  

Here is repo: https://github.com/Atrides/sgminer-monero

What is done: all except of right cryptonight.cl

Miner works currently via RPCv1, available on test-port 8001 on erebor.dwarfpool.com
I have integrated djm's cpu-miner to compare hash, so, debuggers can see it in logs as "DIFFERENT_HASH" if OpenCL gives wrong hash.

In "cryptonight.cl_withaes_noworking" I have added AES implementation from djm. But with some errors.
"cryptonight.cl" == "cryptonight.cl_withkeccak_noaes" does not have AES therefore bad hashes.

So, if anybody can check and make normal "cryptonight.cl", you can use test port 8001.

Moria Server is up on DwarfPool.

Port 3359

moria.dwarfpool.com

http://dwarfpool.com/zeb

DwarfPool - Anonymous Pool for ZebraCoin

http://dwarfpool.com/zeb

* The most profitable and fair RBPPS.
  True round based payment system, proportional your shares
  
* Greatly optimized stratum pool engine,
  the small reject ratio and the best vardiff possible
  
* Maxmimum transparent and detailed statistic

* Monitoring of every rig via email

* No registration required

* No transaction fee, no stealing shares, no hidden fees

* Autopayouts once an hour

* 1% fee

* Separate workers for detailed per rig statistics

* Powerful dedicated failover servers worldwide
  with 64GB RAM, SSD in RAID for more stability

  Choose the closest one as a main server, the others as backup or use them at once.
  All your shares will be calculated from all servers!

* 100% failover-infrastructure uptime

* DDoS protection by different providers

* Not P2Pool! Less orphaned blocks

* "Fake shares" attack resistant

* Excellent Support 24/7 in english, русский, deutsch

* Stratum-port: 3359


http://dwarfpool.com/zeb

DwarfPool Quality you can trust!

On DwarfPool it's possible to mine any coin directly to an exchange without any local wallet.

Just put your personal wallet id getting from exchange

They don't allow in the following cases:

1) Ordinary pools send every minute or so. Some exchanges allows only 6 times per hour. We send reward on hourly basis.

2) They don't like very small amounts, it does not belong to us

3) We don't sent directly from pool-wallet where coins were generated, but use an additional intermediate wallet.

Dwarves miners can mine directly to any exchange (without any local wallet),

just put your personal wallet id getting from exchange.

http://dwarfpool.com/tac

That is also a favorite feature of our Monero-miners ))

good news!

Mine directly to any exchange with DwarfPool (without any local wallet),
just put your personal wallet id getting from exchange.

We also support their requirements - autopayouts from 1 WHRL one time per hour.

That is a favorite feature of our Monero-miners ))

Detailed per rig statistic added on DwarfPool.

On the graphs you сan see individual sent shares for each worker that has own worker-id.

http://dwarfpool.com/sfr

Looks like that:



DwarfPool Quality you can trust!

Detailed per rig statistic added on DwarfPool.

On the graphs you сan see individual sent shares for each worker that has own worker-id.

http://dwarfpool.com/whrl

Looks like that:



DwarfPool Quality you can trust!

Detailed per rig statistic added on DwarfPool.

On the graphs you сan see individual sent shares for each worker that has own worker-id.

http://dwarfpool.com/jpc

Looks like that:



DwarfPool Quality you can trust!

Detailed per rig statistic added on DwarfPool.

On the graphs you сan see individual sent shares for each worker that has own worker-id.

http://dwarfpool.com/xmr

Looks like that:



DwarfPool Quality you can trust!

Detailed per rig statistic added on DwarfPool. On the graphs you сan see individual sent shares for each worker that has own worker-id.

http://dwarfpool.com/tac

Looks like that:



DwarfPool Quality you can trust!

Detailed per rig statistic added. On the graphs you сan see individual sent shares for each worker that has own worker-id.

Looks like that:

Do you only have Nvidia problem cards? And "2 card rig" ATI? I will search where the problem is. And Nvidia cards does not have "no-submit-stale" option.

Now I see that JPC-wallet give us lower diff...I think when PoS blocks come again, we get normal block-time and diff. PoS will be enabled in ca. 20 hours.

I have increased vardiff for power-rigs, so that must be lower "booo"-rate