diff --git a/README.md b/README.md
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+++ b/README.md
@@ -108,7 +108,7 @@ A curated list of amazingly awesome open source sysadmin resources inspired by [
 ## Code Review
 *Web Based collaborative code review system.*
 
-* [Gerrit](https://code.google.com/p/gerrit/) - Based on the Git version control, it facilitates software developers to review modifications to the source code and approve or reject those changes.
+* [Gerrit](https://www.gerritcodereview.com/) - Based on the Git version control, it facilitates software developers to review modifications to the source code and approve or reject those changes.
 * [Review Board](https://www.reviewboard.org/) - Available as free software uner the MIT License.
 
 ## Collaborative Software
@@ -264,7 +264,7 @@ A curated list of amazingly awesome open source sysadmin resources inspired by [
 * [Grafana](http://grafana.org/) - A Graphite & InfluxDB Dashboard and Graph Editor.
 * [Graphite](http://graphite.readthedocs.org/en/latest/) - Open source scaleable graphing server.
 * [InfluxDB](http://influxdb.com/) - Open source distributed time series database with no external dependencies.
-* [KairosDB](https://code.google.com/p/kairosdb/) - Fast distributed scalable time series database, fork of OpenTSDB 1.x.
+* [KairosDB](https://github.com/kairosdb/kairosdb) - Fast distributed scalable time series database, fork of OpenTSDB 1.x.
 * [OpenTSDB](http://opentsdb.net/) - Store and server massive amounts of time series data without losing granularity.
 * [RRDtool](http://oss.oetiker.ch/rrdtool/) - Open source industry standard, high performance data logging and graphing system for time series data.
 * [Statsd](https://github.com/etsy/statsd/) - Application statistic listener.
@@ -299,7 +299,7 @@ A curated list of amazingly awesome open source sysadmin resources inspired by [
   * [FlockDB](https://github.com/twitter/flockdb) - Twitter's distributed, fault-tolerant graph database.
   * [Neo4j](http://www.neo4j.org/) - Open source graph database.
 * Key-Value
-  * [LevelDB](https://code.google.com/p/leveldb/) - Google's high performance key/value database.
+  * [LevelDB](https://github.com/google/leveldb) - Google's high performance key/value database.
   * [Redis](http://redis.io/) - Networked, in-memory, key-value data store with optional durability.
   * [Riak](http://basho.com/riak/) - Another fault-tolerant key-value NoSQL database.