Dunst is a lightweight replacement for the notification daemons provided by most desktop environments. It's very customizable, isn't dependent on any toolkits, and therefore fits into those window manager centric setups we all love to customize to perfection.
signald is a daemon that facilitates communication over Signal.
The BIRD project aims to develop a fully functional dynamic IP routing daemon primarily targeted on (but not limited to) Linux, FreeBSD and other UNIX-like systems and distributed under the GNU General Public License.

HashiCorp Vault secures, stores, and tightly controls access to tokens, passwords, certificates, API keys, and other secrets in modern computing. Vault handles leasing, key revocation, key rolling, and auditing. Through a unified API, users can access an encrypted Key/Value store and network encryption-as-a-service, or generate AWS IAM/STS credentials, SQL/NoSQL databases, X.509 certificates, SSH credentials, and more.
FRRouting (FRR) is an IP routing protocol suite for Linux and Unix platforms which
includes protocol daemons for BGP, IS-IS, LDP, OSPF, PIM, and RIP.
FRR’s seamless integration with the native Linux/Unix IP networking stacks
makes it applicable to a wide variety of use cases including connecting
hosts/VMs/containers to the network, advertising network services, LAN
switching and routing, Internet access routers, and Internet peering.
FRR has its roots in the Quagga project. In fact, it was started by many
long-time Quagga developers who combined their efforts to improve on
Quagga's well-established foundation in order to create the best routing
protocol stack available. We invite you to participate in the FRRouting
community and help shape the future of networking.
Join the ranks of network architects using FRR for ISPs, SaaS infrastructure,
web 2.0 businesses, hyperscale services, and Fortune 500 private clouds.
The BIRD project aims to develop a fully functional dynamic IP routing daemon primarily targeted on (but not limited to) Linux, FreeBSD and other UNIX-like systems and distributed under the GNU General Public License.
The BGP swiss army knife of networking
