http://eosportal.io/

https://steemit.com/eos/@blockliberty/how-to-vote-for-your-favorite-eos-block-producer-using-scatter

https://steemit.com/eos/@greymass/announcing-eos-voter-an-eos-block-producer-voting-tool-and-light-wallet

They are trustworthy but in general the best advice to follow is to have a little bit patience and wait confirmation about the most secure tools/wallets to use the next days ... You can still vote after a week and participate.... The current BPs will just start the chain... The community will decide which will stay and which more will be added...