New websites found recently:

• https://www.viabtc.com/tools/broadcast
• https://pushtx.btc.com/
• https://cryptocurrency360.com/bitcoin-accelerator/
• https://bitaccelerate.com/
• https://btcaccelerators.com/
• https://btc.network/broadcast
• https://blockchair.com/broadcast
• https://btcnitro.com/
• https://blockstream.info/tx/push
• https://bitaps.com/broadcast

Some require the TX (acceleration services) whilst others require the RAW transaction.