rotki is the only local and opensource portfolio tracking tool for the ethereum and other EVM chains.

Additionally we offer a set of opensource and modular decoding system as part of rotki which is unique in the ethereum world. Anyone can use our opensource decoders in their apps to get the same awesome and useful human readable transactions that rotki has.

https://github.com/rotki/rotki/tree/develop/rotkehlchen/chain/ethereum/modules
https://github.com/rotki/rotki/tree/develop/rotkehlchen/chain/optimism