The best open source alternative to Slick is Signal. If that doesn't suit you, our users have ranked more than 10 alternatives to Slick and five of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Slick are Conversations, Telegram X, Xabber and Zom.
An open-source messaging app emphasizing privacy with encrypted communication. Share texts, calls, photos, and videos without ads or trackers, available across major platforms. Developed by Signal Technology Foundation and praised globally for security measures.
Conversations is a privacy focused, open source XMPP Texting [Jabber] client for Android 4.0+ smart phones with wife-approved easy encryption [OTR, OMEMO, or GPG].
An alternative Telegram client based on TDLib, with higher speed, slicker animations and experimental features.
Zom's security and privacy features are powered by the amazing foundation created by the ChatSecure project, and works with other great apps like Conversations.
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