The wiki has a couple more

• https://blockchain.info/pushtx
• https://insight.bitpay.com/tx/send
• https://www.smartbit.com.au/txs/pushtx
• https://coinb.in/#broadcast They can broadcast through different services https://coinb.in/#settings

And of course my favorite method ... drum roll ... Push directly to the network by contacting nodes via a simple code. Basically the "Sending a transaction: tx" part of bitcoins hard way article.