What is the best open source Farcaster client? 
Are there any right now?
I saw Opencast on GitHub but it doesn't display anything on the page besides Server error.

Litecast by @dylsteck.eth is a great one: https://github.com/dylsteck/litecast.

We also open-sourced a lot of the backend for @farquest's Farcaster client, and let anyone build with these free, open-source APIs! docs.far.quest

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The best way to explore farcaster via our pro client 🎩 Grab a free pass @ far.quest and join 90k+ .cast handles! 14k+ people telegram: t.me/+Q_cmS_jf8w1lZjQx

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Thanks a lot!
Litecast looks exactly like what I have been looking for.

Head of Developer Relations at /pinata | Technical Writer | Building honeythread.xyz | Tinkering Photocaster.xyz | stevedylan.dev/links

I did one you can check out here: https://github.com/PinataCloud/farcaster-photo-client-template did a blog post breaking down the main pieces too! https://www.pinata.cloud/blog/how-to-build-a-farcaster-client

best is subjective. Herocast has been around for a minute, and gets exciting new features regularly