I think there is no such online app which would support all coins supported by Ledger Nano S except Ledger apps in Chrome.But if you do not like Chrome apps,for BTC you can use Electrum in combination with your Ledger : https://support.ledgerwallet.com/hc/en-us/articles/115005161925-How-to-use-Electrum-with-your-Nano-S

There is also Electrum clones for LTC,DASH and BCH(ElectronCash),but I am not sure if this versions of wallets support Ledger Nano S.