DB

Relational

PostgreSQL

It has a tools named postgrest, which can more easily create rest api.

client

pgcli: Postgres CLI with autocompletion and syntax highlighting

MySQL

release

mysql
mariadb: An enhanced, drop-in replacement for MySQL

client

mycli: A Terminal Client for MySQL with AutoCompletion and Syntax Highlighting.

Edge Database

SQLite

client

sqlitebrowser

clickhouse

Client(General)

DBeaver: Universal Database Tool
nocodb: Turns any MySQL, PostgreSQL, SQL Server, SQLite & MariaDB into a smart-spreadsheet.
dbcli: Better CLIs for Databases
phpMyAdmin
Sqlectron
dbeaver
SQuirreL
DB Visualizer

Non-relational

Readis
MongoDB

Columnar

influxdata: time series database
databend

Directory

LDAP

Server

openldap
openjd

Client

apache directory studio
LDAP Admin Tool
phpldapadmin

Utils

rethinkdb: The open-source database for the realtime web. https://rethinkdb.com
chartdb: Free and open-source database diagrams editor, visualize and design your DB with a single query.