SOA is a conceptual architecture to provide loosely coupled, interoperable, platform and language independent solution. SOA Lifecycle supports all aspects of an enterprise business process such as design, model, compose, deploy, manage, monitor and optimize. To achieve SOA vision open-source communities providing various tools, technologies and products.
Attune Infocom provides open source SOA solution with the combination of open-source leading technologies with the assurance of enterprise-class support. Attune open source SOA solutions can reduce costs, risk and increase flexibility and profit.

BPM commercial tools are very complicated to use, difficult to deploy and very expensive. Fortunately, open source BPM products are simple to learn and deploy, It provide visual modeling and various BPMS features out of the box.

Intalio BPMS: provides visual modeling UI to model business process using business process modeling notation(BPMN) and automatically generating BPLE-based orchestration.
JBoss jBPM: It is lightweight worklflow engine with as usable Eclipse-based modeler.  It supports all core modeling nodes and easily extensible.
Apache ODE: Apache ODE (Orchestration Director Engine) is lightweight BPLE engine and can be exposed using JBI to ServiceMix.  
WSO2 Business Process Server: it is based on Apache ODE. It provides web-based admin interface and simulation capabilities

There are at least five mature and efficient open source ESBs are available in the market. It is difficult to select any one of them based on their capabilities as they are providing identical features.  

ServiceMix: Excellent JBI-compliant ESB. It supports EI patterns to design complex flow, most of the protocols and many adapters. 
Mule: It is very mature ESB with strong routing, security and transformation. It support EI pattern, real-time choreography and many adapters.
Apache Synapse: simple and lightweight ESB. It provides high performance and availability features for web mediation.
OpenESB: Netbeans has built-in support for OpenESB with GlassFish Application Server. It is new in market.
JBoss ESB: a new in market and not mature but provide good integration with JBoss middleware.

From last couple of years open source Business rules solutions have been available and becoming very popular.

Drools - JBoss Rules: It is lightweight, embeddable and highly efficient and mature rule engine. It includes repository, DSL support and Eclipse-based authoring environment.

Registry is require for storing the various artifact and can be integrated with policy management feature to help in SOA governance.  We can also use open LDAP as registry or we can use following proprietary solutions.

WSO2 Registry: providing storing, indexing, searching, versioning, catalog and metadata to SOA artifacts.
MuleSource Galaxy: It manages SOA artifacts and provides SOA Governance support.

Category	Open Solution	JBoss Solution	WSO2 Solution	Apache Solution
BPM	Intalio	JBoss jBPM	WSO2 BPS	Apache ODE
ESB	Mule/ServiceMix	JBossESB	WSO2 ESB	Apache Synapse
Business Rule	Drools	Drools - JBoss Rules	Other WSO2 products	Other Apache products
Portal	Liferay	JBoss Portal
CMS	Alfresco