Open-source alternatives to Clockwerk

Framework for performing work asynchronously, outside of the request flow

A simple Cron library for go that can execute closures or functions at varying intervals, from once a second to once a year on a specific date and time. Primarily for web applications and long running daemons.

Minimal in-memory deferred task scheduler for Go with ID-based debouncing, cancellation, concurrency limits, and graceful shutdown.

Golang ticker that works with Cron scheduling.

ShedLock is a distributed lock manager designed to prevent scheduled tasks from running concurrently across multiple nodes in a distributed system. It acts as a task coordinator that ensures a single execution of timed jobs by managing lock lifespans and utilizing external lock providers. The system utilizes database-backed providers to store task execution states in external databases, synchronizing locks across active cluster nodes. It includes a clock-drift tolerant synchronizer that handles time discrepancies between distributed nodes through the use of shared timestamps and flexible lock

Package tasks is an easy to use in-process scheduler for recurring tasks in Go

Go cron job scheduler — drop-in replacement for robfig/cron with runtime updates, resilience middleware, and active maintenance

A docker job scheduler (aka. crontab for docker)

Scheduler with standard cron and task dependencies

A job scheduler for Go with the ability to fast-forward time.

Go SDK for Tickstem — reliable cron jobs for production apps

Go SDK for Tickstem heartbeat monitoring — dead-man's switch for scheduled jobs

Lightweight, fast and dependency-free Cron expression parser (due checker, next/prev due date finder), task runner, job scheduler and/or daemon for Golang (tested on v1.13+) and standalone usage. If you are bold, use it to replace crontab entirely.

Go-native distributed job scheduler with delayed tasks, batched Redis coordination, retries, lease-based recovery, and versioned queue partitioning.

cheek: a pico-sized declarative job scheduler

go-job is a flexible and extensible job scheduling and execution library for Go. It enables you to register, schedule, and manage jobs with arbitrary function signatures, supporting custom executors, priorities, and advanced scheduling options such as cron expressions and delayed execution.

cdule (pronounce as Schedule) Golang based scheduler library with database support.

Simple but powerful DAG scheduler and dashboard

An extremely easy way to perform background processing in Java. Backed by persistent storage. Open and free for commercial use.

Persistent cluster-friendly scheduler for Java