Useful software. Clear choices. A better way to find what you need.
DocuSeal creates reusable signing forms from documents and collects electronic signatures through a browser. Its self-hosted open-source edition suits teams that want control over their document-signing workflow and infrastructure.
OpenSign manages document signing through browser-based forms, recipients and document records. Its open-source self-hosted application provides an alternative for organizations that want to operate their own electronic-signature workflow.
Sioyek is a PDF viewer focused on technical books and research papers. Searchable highlights, reference previews and portals help readers move between explanations, figures and citations without losing their place.
Signal provides encrypted messages, group conversations, voice calls and video calls across phones and linked desktops. It is a nonprofit communication app with no advertising and free core messaging and calling.
Element is a Matrix messaging client for rooms, direct conversations and encrypted communication. It lets users connect through a chosen homeserver, with open-source clients and separate options for managed organizational hosting.
Zulip organizes team conversation by both channel and topic, helping discussions remain readable over time. Its self-hosted edition includes the complete chat feature set, with separate mobile-notification and hosting considerations.
Rocket.Chat Starter provides a self-managed communication workspace with channels, direct messages, threads and file sharing. Its free entry is aimed at small teams and technical evaluation rather than a managed enterprise service.
Jitsi Meet offers browser-based video meetings with screen sharing and participant controls. Its open-source software can run on your own infrastructure, while the public meeting service provides a separate hosted experience.
BigBlueButton is an open-source virtual classroom with presentations, whiteboards, breakout rooms and participation tools. It is designed for teaching sessions where interaction and facilitation matter as much as the video connection.
Jami provides messaging, audio and video communication through a distributed design. Its free GNU software is useful for people who want conversations without relying on a conventional centralized chat-service account.
qTox is a desktop client for encrypted peer-to-peer communication over Tox. It combines text chat, voice, video and file transfers for users who want a messenger without a conventional central account service.
Session is a privacy-oriented messenger using generated account identities and a decentralized routing network. It offers direct and group messaging for people who want an alternative to phone-number-based communication services.
Delta Chat provides private messaging using open internet standards and a choice of servers. It combines familiar chat conversations with groups, attachments and multi-device use while avoiding a single mandatory provider.
Cwtch is a decentralized messenger designed to reduce exposed communication metadata. It routes encrypted conversations over Tor onion services and offers desktop and Android applications without a central Cwtch service account.
Mumble is a voice communication system with desktop clients and a self-hostable server. It suits groups that need persistent voice channels, configurable permissions and clear audio for recurring collaboration or gaming sessions.
Pidgin combines multiple supported chat accounts in one desktop application. Its extensible design suits people who still use XMPP, IRC or other supported networks and prefer a single conversation interface.
Gajim is a desktop XMPP client for direct chats, groups, files and encrypted conversations. It works with a provider of your choice and supports people who want federated messaging with a full desktop interface.
Dino is a streamlined XMPP client for Linux desktops with messages, file sharing and calls. It emphasizes a clean conversation interface and supports encrypted communication with compatible contacts and servers.
